1. Delete TntMPD from your Applications folder.
2. Empty your Trash ... Restart your Mac if you can't completely empty your Trash.
3. Reinstall TntMPD into your Applications folder from the DMG (Disc Image) available here:
http://www.tntware.com/tntmpd/downloads/p/26368.aspx
Don't worry, you won't lose your data. Your TntMPD database files are typically stored in your “Documents” or "Dropbox" folder. Think of it this way: Reinstalling Word won’t cause you to lose all your Word documents.