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If you are on a network license, the computer cannot locate the server hosting the license, or the local firewall is blocking the connection. The Hidden Dangers of Mastercam "Cracks"
If you are a student or hobbyist, Mastercam offers a Free Learning Edition (Home Learning Edition/University Edition) that allows you to learn the interface and program parts without needing a physical SIM or crack.
If your legacy hardware key requires an older driver that Windows is blocking:
Hold the key while clicking Restart in the Windows Start Menu.