With "did not work", you mean you still see the SAME error message ?
"Error 3 running C:\Program Files (x86)\Addon Manager\Couatl_Updater2.exe which means The system cannot find the path specified" ?
If yes, then I'm sorry, but the only possible explanation for this error is that your antivirus has mistakenly removed the updater exe, since we surely install it with GSX, so either you haven't configured it correctly, or you might have some other software which is acting like an antivirus, and is doing this.