Had to reinstall all my games on a drive crash. PowerShell install all games, compact after to save space.

[m2themama]

$legendaryPath = "M:\Emulators\Launcher\legendary.exe"
$installDir = "U:\Storefronts\Epic\"

$gameListOutput = & $legendaryPath list

$gameNames = $gameListOutput -split "`n" | Where-Object { $_ -match 'App name: ([a-fA-F0-9]+)' } | ForEach-Object { $_ -replace '.*App name: ([a-fA-F0-9]+).*', '$1' }

$gameNames | ForEach-Object  {
    # Define legendaryPath and installDir again because they are outside the current scope
    $legendaryPath = "M:\Emulators\Launcher\legendary.exe"
    $installDir = "U:\Storefronts\Epic\"

    & $legendaryPath install $_ -i $installDir -y

    $gameFolder = Join-Path $installDir $_  # Assuming game's directory is named after its App name
	
	& compact /c /s /exe:lzx $gameFolder

}

[m2themama]

This runs really well for me on Win 11 and Powershell 7

Save the script in the same folder as Legendary and update the paths and you should be good. It will skip existing installs but will compress if it's not currently.