It said "Unable to locate client installation" please help me fix this problem

I've been having the same problem.

You may uninstall and reinstall the client, this worked when i had the same problem.

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.

Your antivirus might delete it, try re-installing but allowing it to run.

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

diagnosis: skill issue

Ask mods they know everything