Before moving anything, go to your Hitman Absolution installation folder (usually under SteamLibrary\steamapps\common\Hitman Absolution ) and create a backup of the runtime folder.
Once you have secured the English language pack, follow these steps to apply it: hitman absolution english language files verified download
Always scan any downloaded .zip or .rar files with updated antivirus software. A "verified" download should never ask you to disable your firewall or run an .exe file just to extract audio data. Before moving anything, go to your Hitman Absolution