GO LAUNCHER Z NOT RESPONDING SOFTWARE
There is little productive efforts we can do as software developers with these. You are still likely to get false positives. If you are paranoid, you can always inspect the source code yourself and build the launcher from the source code. A simple workaround is to add the launcher binary in your antivirus whitelist or select the action to trust this binary when detected. Poor antivirus products are known to detect the launcher as a threat and block its execution or delete the launcher. My antivirus product detected the launcher as a threat. Those are the main 2 places where files are moved and where you should be able to find them. You can also check for files in your recycle bin.
That is where you should be able to find your previous game version. If you think you lost files during an update, check out the previous_version subdirectory. With the default and recommended settings, the launcher will always move files instead of deleting them. The launcher goes to great lengths not to delete any file that could be important to you. I think the launcher just deleted my files.
GO LAUNCHER Z NOT RESPONDING ARCHIVE
It will assume that mods that are included in the downloaded archive are the newest and latest version and it will keep those by comparing their unique ident value.