Why? It turns out the original DRM (Digital Rights Management) tangles with Unity’s engine in a nasty way. The initial crack bypassed the license check but didn’t properly handle the engine’s memory allocation for the ADV/Novel mode switching.
Thus, is a small, targeted update (usually 5-50MB) designed to resolve critical bugs introduced by the group's initial bypass of the game's SteamStub DRM and custom save encryption.
However, if you grabbed the initial 0-day release of this package, you may have run into a frustrating problem:
The primary reason for the "crackfix" was a severe error occurring at the end of 999: Nine Hours, Nine Persons, Nine Doors
If you encounter issues, check if the game is properly installed and if all necessary frameworks or libraries are correctly installed on your system.
Here is the non-technical breakdown of the changes: