Why has Topaz Clarity suddenly disappeared from my plugins and refuses to reinstall?

During the middle of a batch process, Topaz Clarity suddenly refused to work, disappeared from all of my plugin folders and now says that it will only run on Intel-based systems. It has been running fine through THOUSANDS of photos on this exact system and all of a sudden it quit IN THE MIDDLE OF A BATCH PROCESS! Help! OK - now I’ve moved to my Intel-based McBook Pro and find that it has disappeared from my plugins there and will not function EVEN THOUGH IT IS INTEL-BASED! HELP!