Yes I should have thought of trying that myself, I guess I just assumed the installer would simply overwrite everything.
It may be more intuitive if it would "just work" without the uninstaller, but the github gives the impression that noone's really actively maintaining it so I doubt that'll happen. I'm just happy that it works at all, the seemless integration is much better than always using the koreader file manager (opening KUAL, then the filemanger takes some precious seconds
).