It is very unlikely that it was a “continuous” compression anyway. Continuous archives disallow random file access property, and games require exactly that for

It is very unlikely that it was a “continuous” compression anyway. Continuous archives disallow random file access property, and games require exactly that for assets. You can’t decompress few gb on average to fetch a sprite of a cat. The reason games (and software in general) do full downloads instead of binary patches is purely overdefensive and/or stupid. Store software could just check checksums after a patch and re-download only if they fail.