Unfortunately not. In order to provide some sort of limited or time limited demo Jason would have to add DRM to the program, and he is 100% against doing that. The license file provided is yours to use with as many of your own PC's as you want, there is no DRM at all or limited uses etc. The premium License can be had for as little as $20 which will get you updates for a year, you get to keep Bigbox after that year has ended but you can no longer update it. After the year you can add another year for $10, or upgrade to a lifetime license for a additional $30 (your initial one year $20 plus the $30 to bring it to $50 which is the price of a lifetime license).