Download, unpack, and install the latest version of VirtualBox and the corresponding Extension Pack.

Author: caddyguy

Install-VirtualBox.ps1

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+function Prepare-IwrCommand {
+    # create reg key to skip IExplore/Edge's first run wizard so that Invoke-WebRequest works properly
+    
+    $keyPath = 'HKLM:\SOFTWARE\Policies\Microsoft\Internet Explorer\Main' 
+    try {
+        New-Item -Path $keyPath -Force -ErrorAction Stop | Out-Null
+        Set-ItemProperty -Path $keyPath -Name 'DisableFirstRunCustomize' -Value 1
+    } catch [System.Security.SecurityException],[System.UnauthorizedAccessException] {
+        
+        if ($MyInvocation.MyCommand.Definition.Replace("`r",'') -match 'try {\n(?<adminCommands>(.|\n)+)\n\s*} catch') {
+            $adminCommands = $Matches.adminCommands.Replace('    ','').Replace('$keyPath',"'$keyPath'")
+            Start-Process -FilePath powershell.exe -Verb RunAs -Wait -ArgumentList '-Command',$adminCommands
+        }
+    }
+    
+}
+
+function Install-VirtualBox {
+    # TODO: check if virtualbox and ext pack are alreadu installed before downlaoding
+    # TODO: check if Hyper-V hypervisor is enabled and throw error
+    $downloadPageUri = 'https://download.virtualbox.org/virtualbox'
+    $global:downloadDestination = New-Item -Path $PSScriptRoot -Name Files -ItemType Directory | Select-Object -ExpandProperty FullName
+    try {
+        $latestVersion = Invoke-WebRequest -Uri "$downloadPageUri/LATEST.TXT" -Method Get
+    } catch [System.NotSupportedException] {
+        Prepare-IwrCommand
+        $latestVersion = Invoke-WebRequest -Uri "$downloadPageUri/LATEST.TXT" -Method Get
+    }
+
+    $version = $latestVersion.Content.Trim()
+    $versionFilesPage = Invoke-WebRequest -Uri "$downloadPageUri/$version/"
+
+    # download the installer file to the configured destination
+    if ($versionFilesPage.Content -match '<a href="(?<filename>.*Win\.exe)"') {
+        $installerUri = "$downloadPageUri/$version/$($Matches['filename'])"
+        $installerFile = Join-Path -Path $downloadDestination -ChildPath $Matches['filename']
+        Invoke-WebRequest -Uri $installerUri -Method Get -OutFile $installerFile
+    }
+
+    # download the extension pack to the configured destination
+    if ($versionFilesPage.Content -match '<a href="(?<extPack>.*\.vbox-extpack)"') {
+        $extPackUri = "$downloadPageUri/$version/$($Matches['extPack'])"
+        $extPackFile = Join-Path -Path $downloadDestination -ChildPath $Matches['extPack']
+        Invoke-WebRequest -Uri $extPackUri -Method Get -OutFile $extPackFile
+    }
+
+    # silently extract the MSI from the installer EXE
+    Start-Process -FilePath $installerFile -Verb runas -Wait -ArgumentList '-extract','-silent','-path',$downloadDestination
+
+    # silently install by passing the extracted msi to msiexec with correct arguments
+    $installerMsi = Get-ChildItem -Path $downloadDestination | Where-Object -Property Name -Value 'msi$' -Match | Select-Object -ExpandProperty FullName
+    Start-Process -FilePath msiexec.exe -Verb runas -Wait -ArgumentList '/i',$installerMsi,'/qn','VBOX_INSTALLDESKTOPSHORTCUT=0'
+
+    # add virtualbox install directory to PATH
+    $Env:Path += ';C:\Program Files\Oracle\VirtualBox'
+
+    # install extension pack
+    'y' | vboxmanage extpack install $extPackFile
+
+    # create VirtualBox VMs root folder
+    # TODO: make this customizable
+    $global:VMroot = New-Item -Path $PSScriptRoot -Name VMs -ItemType Directory | Select-Object -ExpandProperty FullName
+}