In the mid-2000s, many users still had dial-up or slow DSL (256–512 kbit/s). Downloading a full 1.2 GB ISO could take days. The Mr. DJ repack cut that to ~300 MB, downloadable in a few hours.
Unlike the Steam version which forces overlay dependency, or the Rockstar Launcher which requires online checks every week, the Mr DJ repack is standalone. You install it on an external hard drive, take it to a friend's house, and play. It asks for nothing. It just works. grand theft auto gta vice city mr dj repack