Disable window to upgrade MusicMatch

I have been using MusicMatch of many years and still use it as my only music manager and player. A while ago I stumbled on a user instruction on how to disable the pop-up window that continually prompts you to upgrade whenever you start musicmatch. It should be stated that I will NEVER use the Yahoo version after working with it for a week. The fix involved renaming some file that exists in the musicmatch folder so the program could not find the file. I have lost the instructions and upgraded my computer so I am back to the prompt. Can anyone help with the way to do this.
Thank you very much