Roberto
Can you please try reinstalling it? Make sure that your Firewalls/antivirus are not blocking SpaceClaim from running (temporarily turn off firewalls and antivirus).
There is also a slim possibility that some security setting in Windows has been changed and is now blocking this.
It is recommended to have graphics cards with 1 GB of graphics memory or higher for SpaceClaim and can be the reason but I will once confirm with the team and will let you know.
Regards.
You are navigating away from the AIS Discovery experience