I think you just don't get updates after 1 yr:
@Grr You have a point. Would probably be a good idea upon *nearing* 1 yr expiration to offer a lifetime license at a discount (as well as alert about it reverting to free version)* The license to use Internet Download Manager on one computer for any purpose
* Additional features not available in the trial version like built-in download accelerator to achieve maximum download performance
* No IDM usage limitations that existed in the trial version
* Prioritized technical support
* FREE upgrade to all new versions of IDM during one year