With a , you get 1 year of free updates (or lifetime, depending on your tier). You click "Check for updates" inside the software. It installs. You move on with your day.
Cracked versions of CAD software are notorious for instability.
The search for a "ProfiCAD license key" often leads users toward "cracked" versions or key generators, but the "better" approach for both professional and personal use is to utilize the software's legitimate licensing options.