All right then. I'm aware this is an old topic but I've got the same issue here.
I Installed TSLRCM 1.8.5 + M4-78 1.2.4. (I know this isn't the latest M4 version but I believed that shouldn't be an issue). I use the GOG version of KOTOR II. Then I felt compelled to uninstall M4 (through the uninstaller) even though I knew the risks - I had read online it can break Sith academy and other stuff. To answer your question - 'why?' - my motives were simple - older PC couldnt handle the exceptional lag at M4 (probably not the mod's fault). Then the whole planet's quests and overall feel just drifted away from the main flow of action of the game or at least it felt that way for me. I could've mustered the patience to finish it to move the story along, but was I ready to do that *every* single time I replayed the game? Certainly not. So don't get me wrong, M4 is a very good addition for a fan restored planet. It's just not my cup of tea.
So, back to the issue, with TSLRCM 1.8.5 + M4-78 1.2.4 everything ran smooth, restored content was there working and I developed my char all the way through the story, got to Korriban Sith academy and there was no Vash body like it's supposed to etc. I went to M4-78, then decided to uninstall. I used the application, deluding myself I can 'fix' whatever damage this might cause. Of course I knew my save thus far was done.
Now I started a new game to test the game's stability after M4's removal. After playing hours on end, there were strange bugs here and there (long forgotten Red Eclipse bug on Nar Shadaa?) but when I found a workaround, overall the game was playable. That is until I reached the Sith Korriban academy again. Now the game simply goes to a black screen when I try to enter and there seems to be no way to fix this. I tried reinstalling TSLRCM, no effect. I then uninstalled TSLRCM through it's own uninstall .exe and installed it again. Reloaded save, same thing. Tried earlier save before loading Korriban - same.
I know I probably broke my mod build and probably my whole game. What bothers me is that that uninstalling and installing TSLRCM *should* fix the issue, at least nominally. Other bugs and issues might appear, but the essential module altering files (that seem to cause the issue) should be in their correct place again, removing the bug. As I browsed/searched the Modules folder after I reinstalled TSLRCM, there are still no 702Kor files of any kind, if there were supposed to be there in the first place.
I am kind of perplexed. How do I proceed now to get TSLRCM only working as it should? Any help would be appreciated.