The trial version is limited to a few moves. The engine strength is also reduced.
Please note that demo version is much weaker than the full version (plays like Martin bot at chess.com).
The trial version is needed to test basic functions only, like chessboard recognition, ability to work with chess engines, show best moves and make moves by itself. If it works for you, then a full version will also work fine. If not, please read instructions and faq.
If nothing helps and you need help with setup, please contact us.