did you have any issue with opening the program after downloading?
on my Mac, I double-click, then get the (normal) message that it is from an unidentified developer. I give permission to open anyway. the icon bounces a few times in the dock but never opens. this happens both on Big Sur and Catalina.
I tried the PC version, and the Windows 10 antivirus system flags it as malware and won't open it.
update: apparently Windows Defender hasn't seen this app often enough to declare it safe. I persuaded Bill Gates to let me open it anyway.
however, still won't open on my Mac, which I would rather use. I am awaiting "membership" in the xtrkcad Google group so I can post a question about it.
Update 2: I was able to join the forum and someone quickly responded to my post. I've been using Macs forever but had never encountered a program called "XQuartz". it's an X11 windows handler that I needed to add to my system, then the program opened properly. I have downloaded the 134-page manual and am studying.
ken