SleepW4lker If Add/Remove Programs section of your OS does not contain the game - yep, just delete the game folder. Current version is definitely portable and does not install anything; back in 2020 - I cannot say, I started playing the game in 2022 and am unaware of how things worked prior to that.
Small experiment you could try: if you are sure that your old version of the game is the PPX version
and feel adventurous, you could try keeping that folder and simply updating
You must be registered to see the links
as per their instructions. That might actually be enough to get you up and running. Chances are, AAU is going to work just fine. The catch is, if you have any mods attached to that old version - they are
extremely likely to be outdated (clothing ones -
guaranteed). In other words, if you add no more custom content to the old version - it will probably work, but if you do start adding stuff - probably going to hiccup eventually.
Still, bear in mind that the above is more "try if you feel like it" than anything - at the end of the day, I would go with "start from scratch" either way, since I would be adding user-created character cards for sure.