Of course moving the mod manager to Disk C solved the fucking issue. Why wouldn't it?
Sometimes, I wish I could release all the stress in one nice autistic screech....
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Just get a fast small disk for OS, and add HUGE disks for everything else... That way, you won't lose data when reinstalling OS right???, RIGHT????
As long as you don't install software on C, you're safe...
WHY DOES HALF OF THE FUCKING SOFTWARE INSTALL ITSELF OF FUCKING C, AND THE OTHER HALF DOESN'T EVEN FUCKING WORK!!!???
It would be SO FUCKING EASY YOU ASSHOLES!!!
@zatrsakr
I idn't want solutions, I just want to be heard. 
Also, is it REALLY that hard for the installer to just ask?
@LukeAlmighty https://www.makeuseof.com/tag/move-installed-apps-programs-windows-10/#how-to-change-the-default-installation-path-of-apps-and-programs-on-windows-10-and-11