Blockland broke, so I uninstalled it. The setup made a launcher successfully, but the launcher keeps giving the error

'C:\Users\Picto\Documents\Blockland\' Isn't displayed as existing, it is un-targetable, un-removable, un-replaceable, It's as if the file is invincible. I have downloaded new Setup.exe, set new install locations, restarted my computer, and even gone to cmd with remove attempts. Please. Help me. I just want to play.