Ja weil es frei ist.
Sie können den design nicht sparen.Es wird nur Sie mit ihm spielen lassen, Ihnen eine Idee zu geben.

Not sure what you are saying, but if it is a free trial verison you can not save your design. They only allow you to play with the program.

It is not a trial version, you can´t buy a version of it, but the programme is still being developed. You can save the designs and use them, but I noticed that when I did anything wrong, click right instead of left for instance, the programme just froze and I had to restart. Only way out for me was to save and save again as I went through the different steps, so I could go on with what I had saved after a restart. The programme is far from perfect, alas.