A highly compressed version of Hitman 2 is a repackaged installer—typically created by unofficial groups like FitGirl, DODI, or ElAmigos—that shrinks the download size dramatically. Instead of 100–150 GB, a repack might be . It achieves this by using extreme compression algorithms on normally bloated files (audio, textures, video cutscenes).
For a visual guide on finding and downloading these types of files for PC: 05:06 hitman 2 highly compressed