diff --git a/components/authenticator.js b/components/authenticator.js
index 2781ba3..d3e7b52 100644
--- a/components/authenticator.js
+++ b/components/authenticator.js
@@ -1,14 +1,17 @@
 const request = require('request')
-const uuid = require('uuid').v1
+const { v3 } = require('uuid')
+
+let uuid
 let api_url = 'https://authserver.mojang.com'
 
 module.exports.getAuth = function (username, password, client_token = null) {
   return new Promise((resolve, reject) => {
+    getUUID(username)
     if (!password) {
       const user = {
-        access_token: uuid(),
-        client_token: client_token || uuid(),
-        uuid: uuid(),
+        access_token: uuid,
+        client_token: client_token || uuid,
+        uuid,
         name: username,
         user_properties: '{}'
       }
@@ -23,9 +26,9 @@ module.exports.getAuth = function (username, password, client_token = null) {
           name: 'Minecraft',
           version: 1
         },
-        username: username,
-        password: password,
-        clientToken: uuid(),
+        username,
+        password,
+        clientToken: uuid,
         requestUser: true
       }
     }
@@ -50,13 +53,13 @@ module.exports.getAuth = function (username, password, client_token = null) {
   })
 }
 
-module.exports.validate = function (access_token, client_token) {
+module.exports.validate = function (accessToken, clientToken) {
   return new Promise((resolve, reject) => {
     const requestObject = {
       url: api_url + '/validate',
       json: {
-        accessToken: access_token,
-        clientToken: client_token
+        accessToken,
+        clientToken
       }
     }
 
@@ -74,8 +77,8 @@ module.exports.refreshAuth = function (accessToken, clientToken) {
     const requestObject = {
       url: api_url + '/refresh',
       json: {
-        accessToken: accessToken,
-        clientToken: clientToken,
+        accessToken,
+        clientToken,
         requestUser: true
       }
     }
@@ -88,13 +91,13 @@ module.exports.refreshAuth = function (accessToken, clientToken) {
 
       const userProfile = {
         access_token: body.accessToken,
-        client_token: uuid(),
+        client_token: getUUID(body.selectedProfile.name),
         uuid: body.selectedProfile.id,
         name: body.selectedProfile.name,
         user_properties: parsePropts(body.user.properties)
       }
 
-      resolve(userProfile)
+      return resolve(userProfile)
     })
   })
 }
@@ -104,16 +107,16 @@ module.exports.invalidate = function (accessToken, clientToken) {
     const requestObject = {
       url: api_url + '/invalidate',
       json: {
-        accessToken: accessToken,
-        clientToken: clientToken
+        accessToken,
+        clientToken
       }
     }
 
     request.post(requestObject, function (error, response, body) {
       if (error) return reject(error)
 
-      if (!body) resolve(true)
-      else reject(body)
+      if (!body) return resolve(true)
+      else return reject(body)
     })
   })
 }
@@ -123,16 +126,16 @@ module.exports.signOut = function (username, password) {
     const requestObject = {
       url: api_url + '/signout',
       json: {
-        username: username,
-        password: password
+        username,
+        password
       }
     }
 
     request.post(requestObject, function (error, response, body) {
       if (error) return reject(error)
 
-      if (!body) resolve(true)
-      else reject(body)
+      if (!body) return resolve(true)
+      else return reject(body)
     })
   })
 }
@@ -156,3 +159,10 @@ function parsePropts (array) {
     return '{}'
   }
 }
+
+function getUUID (value) {
+  if (!uuid) {
+    uuid = v3(value, v3.DNS)
+  }
+  return uuid
+}
diff --git a/components/handler.js b/components/handler.js
index aaf8257..c3e2358 100644
--- a/components/handler.js
+++ b/components/handler.js
@@ -458,7 +458,7 @@ class Handler {
   runInstaller (path) {
     return new Promise(resolve => {
       const installer = child.exec(path)
-      installer.on('close', (code) => resolve())
+      installer.on('close', (code) => resolve(code))
     })
   }
 
diff --git a/components/launcher.js b/components/launcher.js
index c87b4b1..27b72be 100644
--- a/components/launcher.js
+++ b/components/launcher.js
@@ -6,133 +6,144 @@ const EventEmitter = require('events').EventEmitter
 
 class MCLCore extends EventEmitter {
   async launch (options) {
-    this.options = { ...options }
-    this.options.root = path.resolve(this.options.root)
-    this.options.overrides = {
-      detached: true,
-      ...this.options.overrides,
-      url: {
-        meta: 'https://launchermeta.mojang.com',
-        resource: 'https://resources.download.minecraft.net',
-        mavenForge: 'http://files.minecraftforge.net/maven/',
-        defaultRepoForge: 'https://libraries.minecraft.net/',
-        fallbackMaven: 'https://search.maven.org/remotecontent?filepath=',
-        ...this.options.overrides
-          ? this.options.overrides.url
-          : undefined
-      },
-      fw: {
-        baseUrl: 'https://github.com/ZekerZhayard/ForgeWrapper/releases/download/',
-        version: '1.5.5',
-        sh1: '566dfd60aacffaa02884614835f1151d36f1f985',
-        size: 34331,
-        ...this.options.overrides
-          ? this.options.overrides.fw
-          : undefined
-      }
-    }
-
-    this.handler = new Handler(this)
-
-    this.printVersion()
-
-    const java = await this.handler.checkJava(this.options.javaPath || 'java')
-    if (!java.run) {
-      this.emit('debug', `[MCLC]: Couldn't start Minecraft due to: ${java.message}`)
-      this.emit('close', 1)
-      return null
-    }
-
-    this.createRootDirectory()
-    this.createGameDirectory()
-
-    await this.extractPackage()
-
-    if (this.options.installer) {
-      // So installers that create a profile in launcher_profiles.json can run without breaking.
-      const profilePath = path.join(this.options.root, 'launcher_profiles.json')
-      if (!fs.existsSync(profilePath)) { fs.writeFileSync(profilePath, JSON.stringify({}, null, 4)) }
-      await this.handler.runInstaller(this.options.installer)
-    }
-
-    const directory = this.options.overrides.directory || path.join(this.options.root, 'versions', this.options.version.custom ? this.options.version.custom : this.options.version.number)
-    this.options.directory = directory
-
-    const versionFile = await this.handler.getVersion()
-    const mcPath = this.options.overrides.minecraftJar || (this.options.version.custom
-      ? path.join(this.options.root, 'versions', this.options.version.custom, `${this.options.version.custom}.jar`)
-      : path.join(directory, `${this.options.version.number}.jar`))
-    this.options.mcPath = mcPath
-    const nativePath = await this.handler.getNatives()
-
-    if (!fs.existsSync(mcPath)) {
-      this.emit('debug', '[MCLC]: Attempting to download Minecraft version jar')
-      await this.handler.getJar()
-    }
-
-    const modifyJson = await this.getModifyJson()
-
-    const args = []
-
-    let jvm = [
-      '-XX:-UseAdaptiveSizePolicy',
-      '-XX:-OmitStackTraceInFastThrow',
-      '-Dfml.ignorePatchDiscrepancies=true',
-      '-Dfml.ignoreInvalidMinecraftCertificates=true',
-      `-Djava.library.path=${nativePath}`,
-      `-Xmx${this.handler.getMemory()[0]}`,
-      `-Xms${this.handler.getMemory()[1]}`
-    ]
-    if (this.handler.getOS() === 'osx') {
-      if (parseInt(versionFile.id.split('.')[1]) > 12) jvm.push(await this.handler.getJVM())
-    } else jvm.push(await this.handler.getJVM())
-
-    if (this.options.customArgs) jvm = jvm.concat(this.options.customArgs)
-    if (this.options.overrides.logj4ConfigurationFile) {
-      jvm.push(`-Dlog4j.configurationFile=${path.resolve(this.options.overrides.logj4ConfigurationFile)}`)
-    }
-    // https://help.minecraft.net/hc/en-us/articles/4416199399693-Security-Vulnerability-in-Minecraft-Java-Edition
-    if (parseInt(versionFile.id.split('.')[1]) === 17) jvm.push('-Dlog4j2.formatMsgNoLookups=true')
-    if (parseInt(versionFile.id.split('.')[1]) < 17) {
-      if (!jvm.find(arg => arg.includes('Dlog4j.configurationFile'))) {
-        const configPath = path.resolve(this.options.overrides.cwd || this.options.root)
-        const intVersion = parseInt(versionFile.id.split('.')[1])
-        if (intVersion >= 12) {
-          await this.handler.downloadAsync('https://launcher.mojang.com/v1/objects/02937d122c86ce73319ef9975b58896fc1b491d1/log4j2_112-116.xml',
-            configPath, 'log4j2_112-116.xml', true, 'log4j')
-          jvm.push('-Dlog4j.configurationFile=log4j2_112-116.xml')
-        } else if (intVersion >= 7) {
-          await this.handler.downloadAsync('https://launcher.mojang.com/v1/objects/dd2b723346a8dcd48e7f4d245f6bf09e98db9696/log4j2_17-111.xml',
-            configPath, 'log4j2_17-111.xml', true, 'log4j')
-          jvm.push('-Dlog4j.configurationFile=log4j2_17-111.xml')
+    try {
+      this.options = { ...options }
+      this.options.root = path.resolve(this.options.root)
+      this.options.overrides = {
+        detached: true,
+        ...this.options.overrides,
+        url: {
+          meta: 'https://launchermeta.mojang.com',
+          resource: 'https://resources.download.minecraft.net',
+          mavenForge: 'http://files.minecraftforge.net/maven/',
+          defaultRepoForge: 'https://libraries.minecraft.net/',
+          fallbackMaven: 'https://search.maven.org/remotecontent?filepath=',
+          ...this.options.overrides
+            ? this.options.overrides.url
+            : undefined
+        },
+        fw: {
+          baseUrl: 'https://github.com/ZekerZhayard/ForgeWrapper/releases/download/',
+          version: '1.5.5',
+          sh1: '566dfd60aacffaa02884614835f1151d36f1f985',
+          size: 34331,
+          ...this.options.overrides
+            ? this.options.overrides.fw
+            : undefined
         }
       }
+
+      this.handler = new Handler(this)
+
+      this.printVersion()
+
+      const java = await this.handler.checkJava(this.options.javaPath || 'java')
+      if (!java.run) {
+        this.emit('debug', `[MCLC]: Couldn't start Minecraft due to: ${java.message}`)
+        this.emit('close', 1)
+        return null
+      }
+
+      this.createRootDirectory()
+      this.createGameDirectory()
+
+      await this.extractPackage()
+
+      if (this.options.installer) {
+        // So installers that create a profile in launcher_profiles.json can run without breaking.
+        const profilePath = path.join(this.options.root, 'launcher_profiles.json')
+        if (!fs.existsSync(profilePath) || !JSON.parse(fs.readFileSync(profilePath)).profiles) {
+          fs.writeFileSync(profilePath, JSON.stringify({ profiles: {} }, null, 4))
+        }
+        const code = await this.handler.runInstaller(this.options.installer)
+        if (!this.options.version.custom && code === 0) {
+          this.emit('debug', '[MCLC]: Installer successfully ran, but no custom version was provided')
+        }
+        this.emit('debug', `[MCLC]: Installer closed with code ${code}`)
+      }
+
+      const directory = this.options.overrides.directory || path.join(this.options.root, 'versions', this.options.version.custom ? this.options.version.custom : this.options.version.number)
+      this.options.directory = directory
+
+      const versionFile = await this.handler.getVersion()
+      const mcPath = this.options.overrides.minecraftJar || (this.options.version.custom
+        ? path.join(this.options.root, 'versions', this.options.version.custom, `${this.options.version.custom}.jar`)
+        : path.join(directory, `${this.options.version.number}.jar`))
+      this.options.mcPath = mcPath
+      const nativePath = await this.handler.getNatives()
+
+      if (!fs.existsSync(mcPath)) {
+        this.emit('debug', '[MCLC]: Attempting to download Minecraft version jar')
+        await this.handler.getJar()
+      }
+
+      const modifyJson = await this.getModifyJson()
+
+      const args = []
+
+      let jvm = [
+        '-XX:-UseAdaptiveSizePolicy',
+        '-XX:-OmitStackTraceInFastThrow',
+        '-Dfml.ignorePatchDiscrepancies=true',
+        '-Dfml.ignoreInvalidMinecraftCertificates=true',
+        `-Djava.library.path=${nativePath}`,
+        `-Xmx${this.handler.getMemory()[0]}`,
+        `-Xms${this.handler.getMemory()[1]}`
+      ]
+      if (this.handler.getOS() === 'osx') {
+        if (parseInt(versionFile.id.split('.')[1]) > 12) jvm.push(await this.handler.getJVM())
+      } else jvm.push(await this.handler.getJVM())
+
+      if (this.options.customArgs) jvm = jvm.concat(this.options.customArgs)
+      if (this.options.overrides.logj4ConfigurationFile) {
+        jvm.push(`-Dlog4j.configurationFile=${path.resolve(this.options.overrides.logj4ConfigurationFile)}`)
+      }
+      // https://help.minecraft.net/hc/en-us/articles/4416199399693-Security-Vulnerability-in-Minecraft-Java-Edition
+      if (parseInt(versionFile.id.split('.')[1]) === 17) jvm.push('-Dlog4j2.formatMsgNoLookups=true')
+      if (parseInt(versionFile.id.split('.')[1]) < 17) {
+        if (!jvm.find(arg => arg.includes('Dlog4j.configurationFile'))) {
+          const configPath = path.resolve(this.options.overrides.cwd || this.options.root)
+          const intVersion = parseInt(versionFile.id.split('.')[1])
+          if (intVersion >= 12) {
+            await this.handler.downloadAsync('https://launcher.mojang.com/v1/objects/02937d122c86ce73319ef9975b58896fc1b491d1/log4j2_112-116.xml',
+              configPath, 'log4j2_112-116.xml', true, 'log4j')
+            jvm.push('-Dlog4j.configurationFile=log4j2_112-116.xml')
+          } else if (intVersion >= 7) {
+            await this.handler.downloadAsync('https://launcher.mojang.com/v1/objects/dd2b723346a8dcd48e7f4d245f6bf09e98db9696/log4j2_17-111.xml',
+              configPath, 'log4j2_17-111.xml', true, 'log4j')
+            jvm.push('-Dlog4j.configurationFile=log4j2_17-111.xml')
+          }
+        }
+      }
+
+      const classes = this.options.overrides.classes || this.handler.cleanUp(await this.handler.getClasses(modifyJson))
+      const classPaths = ['-cp']
+      const separator = this.handler.getOS() === 'windows' ? ';' : ':'
+      this.emit('debug', `[MCLC]: Using ${separator} to separate class paths`)
+      // Handling launch arguments.
+      const file = modifyJson || versionFile
+      // So mods like fabric work.
+      const jar = fs.existsSync(mcPath)
+        ? `${separator}${mcPath}`
+        : `${separator}${path.join(directory, `${this.options.version.number}.jar`)}`
+      classPaths.push(`${this.options.forge ? this.options.forge + separator : ''}${classes.join(separator)}${jar}`)
+      classPaths.push(file.mainClass)
+
+      this.emit('debug', '[MCLC]: Attempting to download assets')
+      await this.handler.getAssets()
+
+      // Forge -> Custom -> Vanilla
+      const launchOptions = await this.handler.getLaunchOptions(modifyJson)
+
+      const launchArguments = args.concat(jvm, classPaths, launchOptions)
+      this.emit('arguments', launchArguments)
+      this.emit('debug', `[MCLC]: Launching with arguments ${launchArguments.join(' ')}`)
+
+      return this.startMinecraft(launchArguments)
+    } catch (e) {
+      this.emit('debug', `[MCLC]: Failed to start due to ${e}, closing...`)
+      return null
     }
-
-    const classes = this.options.overrides.classes || this.handler.cleanUp(await this.handler.getClasses(modifyJson))
-    const classPaths = ['-cp']
-    const separator = this.handler.getOS() === 'windows' ? ';' : ':'
-    this.emit('debug', `[MCLC]: Using ${separator} to separate class paths`)
-    // Handling launch arguments.
-    const file = modifyJson || versionFile
-    // So mods like fabric work.
-    const jar = fs.existsSync(mcPath)
-      ? `${separator}${mcPath}`
-      : `${separator}${path.join(directory, `${this.options.version.number}.jar`)}`
-    classPaths.push(`${this.options.forge ? this.options.forge + separator : ''}${classes.join(separator)}${jar}`)
-    classPaths.push(file.mainClass)
-
-    this.emit('debug', '[MCLC]: Attempting to download assets')
-    await this.handler.getAssets()
-
-    // Forge -> Custom -> Vanilla
-    const launchOptions = await this.handler.getLaunchOptions(modifyJson)
-
-    const launchArguments = args.concat(jvm, classPaths, launchOptions)
-    this.emit('arguments', launchArguments)
-    this.emit('debug', `[MCLC]: Launching with arguments ${launchArguments.join(' ')}`)
-
-    return this.startMinecraft(launchArguments)
   }
 
   printVersion () {
diff --git a/package.json b/package.json
index 4f7ecda..82a5cf4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "minecraft-launcher-core",
-  "version": "3.16.11",
+  "version": "3.16.12",
   "description": "Lightweight module that downloads and runs Minecraft using javascript / NodeJS",
   "main": "index.js",
   "dependencies": {