#Thanks to: https://www.andrewcbancroft.com/2015/12/16/using-powershell-to-install-a-dll-into-the-gac/
#Summary: Adds the contents of a folder to the GAC.  Only gets .dll files.
#Example: .\Add-GacAssembly.ps1 .\MySubFolder


param (
    $location = $(throw '- location required')
)
#Run PowerShell as an Administrator
[System.Reflection.Assembly]::Load("System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")            
$publish = New-Object System.EnterpriseServices.Internal.Publish            
$inputFiles = Get-ChildItem "$location\*.dll"
foreach ($file in $inputFiles)
{
    write-host "File $file" -NoNewLine
    $publish.GacInstall($file.FullName)
    write-host " has been added to the GAC"
}