The RunAsLevel preference setting allows to run BricsCAD in a lower license level, e.g. a Pro version can be run as a Lite, an Ultimate license can be run as a Lite or Pro. This facilitates the evaluation of the features available for each license level.
To set the RunAsLevel user preference, execute the SETLICENSELEVEL command.
I went to check the availability of a feature in a lower license level.
The availability of a feature depends on the license level.
All features are available in a trial license.
See also How to try a higher license level.