For cracked versions, sometimes the language is hardcoded in the registry or an .ini file.
Before searching for manual file downloads, try these platform-specific fixes to have the files downloaded automatically: How do I change the Language? :: Hitman - Steam Community Hitman Absolution English File
Because "Hitman Absolution English File" is a highly targeted search query, many malicious websites host fake .zip or .exe files claiming to be the language pack. For cracked versions, sometimes the language is hardcoded