also, reminder: if it appears a "(1)" on the name of the client / setup, rename it whitout the "(1)", and dont delete the setup, i did and the same problem appeared again.
Hold Windows key and R and then type in: %USERPROFILE%\AppData\Roaming Then find Polytoria folder and delete it, now hold the Windows key and R again type this in: %USERPROFILE%\Local\Programs Find Polytoria folder again and delete it and now go to games page and click download (windows) and run it and it should work if it deosn't then idk