While repacking solves technical issues regarding file size and compatibility, it remains a violation of copyright law. The distribution of "cracked" executables infringes upon the intellectual property rights of the developer (Rockstar Games) and the publisher.
The original game is roughly . To get it down to 700MB, "repackers" usually perform heavy modifications:
You might find the game jumps straight from one mission to the next with no story in between. Lowered Textures: