RePacks use heavy "lossy" or "lossless" compression. While the download is fast, your CPU has to work incredibly hard to decompress the files. An installation that takes 10 minutes for a retail game might take two hours for a repack.
For users with slow internet or data caps, downloading a 20GB repack is much easier than downloading 60GB+ of original retail files. Assassin’s Creed Anthology – RePack by CorePack
The is a relic of an era where storage and bandwidth were at a premium. While it serves as a convenient "museum piece" for the series' roots, the average player is usually better off with official digital versions. Modern storefronts provide cloud saves, achievements, and better compatibility with new hardware that unofficial repacks often lack. RePacks use heavy "lossy" or "lossless" compression
A "repack" is a version of a game where the files have been heavily compressed to make the initial download smaller. CorePack was a well-known group that specialized in this, often stripping out "unnecessary" files like multi-language voiceovers or lower-resolution videos to save space. For users with slow internet or data caps,