Upgrade PowerShellGet if it's too old

Author: Jaykul

Install-RequiredModule.ps1

@@ -1,4 +1,12 @@
 Push-Location $PSScriptRoot
+
+# Some people only have a really old version of PowerShellGet that doesn't support pre-release modules
+if (!(Get-Command Install-Module -ParameterName 'AllowPrerelease' -ErrorAction 'SilentlyContinue')) {
+    $Module = Install-Module 'PowerShellGet' -Repository 'PSGallery' -MaximumVersion 2.99 -MinimumVersion 2.2.5 -Force -Scope CurrentUser -PassThru
+    Remove-Module PowerShellGet
+    Import-Module PowerShellGet -MinimumVersion $Module.Version -Force
+}
+
 try {
     $Script = Install-Script Install-RequiredModule -PassThru -Force
     & (Join-Path $Script.InstalledLocation Install-RequiredModule.ps1)