@nuka
I believe the standard practice in majority of games is that save files are removed on uninstall. This usually works since people play it until they are done, and uninstall the game. When installing next time they start over because they wanted to play the game again. For these purposes you may sometimes have to save your save file if you want to re-install and resume from some other state than empty.
@sanahtlig
Since it is an “unofficial” patch, I suspect they need to verify that it works with the bug fixes they are doing for the game. They’d really get hell if they released a game buggy, fixed the bugs, then released the desired patch, and you got bugs again. And of course, they probably want the physical discs to be pre-patched so not everyone who pays extra for limited edition is not getting a “limited playtime edition”.
In my opinion they are doing these things right so far. It is just that they could have had proper testers and not customers for this final stretch.