Is JAUpscaled actually tested and working? I couldn't find a reference to it anywhere else and the zips are not unpacking properly.
Topic on Talk:Star Wars: Jedi Knight - Jedi Academy
I'm pretty sure it's been tested; I'd have to check discussion on the Game Upscale Discord, as I don't have the game.
The "zips" are actually a single 7z archive, split into 3 files. Make sure they are all downloaded, then open the one with the .001
extension.
Regardless, it's a dead project, as both people working on it stopped doing so.