Find all MSI files and install them from a directory

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$Path = Get-ChildItem -Path C:\Windows\CCMCache -Recurse -Filter *.MSI
ForEach ( $Installer in ( Get-ChildItem -Path $Path.DirectoryName -Filter *.MSI ) ) {
    Start-Process -Wait -FilePath C:\windows\system32\msiexec.exe -ArgumentList "/i $Installer.FullName /passive /norestart"
    }