To understand the value of this repack, you need to know the source material. There are two primary candidates for the base game:
The primary purpose of a repack is data compression. Groups or individuals take the original game files and apply heavy compression algorithms to reduce the download size, making it far more bandwidth-friendly. However, this compression comes with a trade-off: the installation process from a repack is often much longer than from a standard ISO or digital download, as your computer has to decompress all the files.
Since "repacks" are often distributed through community forums or third-party sites, always verify the source's reputation. Would you like assistance finding specific walkthroughs for the in-game puzzles once you have it running?