if it helps. This seems to be only on Catalina. I opened up a old imac (Early 2009 that had El Capitan(2015) ) And that computer opened the app just fine.
Rexuiz.app.zip - here is a link to quick fix. Could you please backup you current Rexuiz.app folder, and place file over it? It have to fix that Catalina issue with relative paths in game
Btw, regarding this one -> Issue on catalina if your version of catalina outdated, you may fix it just updating to latest.
oh yeah, sorry for not responding, was busy with something. Didn't really fix it. Oh well, still works regardless.
Just add this info for people with Sierra/Catalina (I have a friend who has Big Sur but he didn't have a problem clicking on the app)
- right click app and click "show package contents"
-Go to Contents > MacOS
- Click file named rexuiz-dprm-sdl