The definitions frame on the TrIDNet window say "No definitions found!", and the about box show upWhen TrIDNet need to load his definition's database (when [Rescan] button is clicked, or when attempting the first scan), it look in the same folder in witch is was installed/unzipped for a "defs" subfolder.
So, you simply need to go to the TrIDNet home page, download the XML definitions package and then unpack it in the same TrIDNet's folder.
Here's the link (see the bottom of the page):
TrIDNetBye!