SmartCVS is available in two versions, the free Foundation version with a basic feature set and the commercial Professional version with advanced and convenience features (see http://www.syntevo.com/smartcvs/features.html). Both program versions may be used for non-commercial and commercial purposes. The Professional version includes one year of free updates - no matter what version number.
To evaluate the Professional version, you can get a demo license key from the web-site http://www.syntevo.com/smartcvs/evaluate.html. To purchase SmartCVS Professional licenses, go to http://www.syntevo.com/smartcvs/purchase.html.
A physical difference between the Foundation and Professional version is, that the latter one is detected by a valid license file. Which kind of version you are currently using, is displayed in the title of the SmartCVS main window. To switch back to the Foundation version, delete the file license in the SmartCVS settings directory.