How do I uninstall Macaos v3.85?

First, open Macaos v3.85 and go to the Settings page. Check the Input, Output and Temp folders. You probably want to delete the temp folder. You might also wish to delete the other two, but be sure you don't delete any important files.

Then, simply delete the entire folder and all subfolders. Macaos 3.85 does not have any entries in the registry.