Your License Is Not Valid Rhino Needs A License To Run Patched ^new^ -

Even with a legitimate license, the error can appear if Rhino's local license cache files become corrupted. This can happen after a Windows update, a system crash, or simply due to general disk errors. These cache files are stored in a hidden folder on your computer. For example, on Windows, the path is often C:\ProgramData\McNeel\Rhinoceros\[version number]\License Manager\Licenses\ . If Rhino reads one of these files and finds it unreadable, it will assume the license is no longer valid.