"Inspector Butters" South Park Flash game missing levels

Inspector Butters is a Flash game that consists of various minigame versions of scenes from the episode "Butters' Very Own Episode". The first level is playable multiple places online (here, here, and here) However, trying to continue to the second level or entering the password for any of the other levels (oj, ramsey, gary condit, some puerto rican guy) gives an error message

 

Comments and captures show that it was fully playable up to at least 2015, so I'm assuming this is just a problem with Flash emulators running it. It doesn't seem to be on Flashpoint and the game doesn't start at all when opening the swf file.

I'm pretty clueless when it comes to messing with Flashes, so I was hoping y'all could help and maybe it'd end up being an easier recovery than I assumed. Thank you!