Sometimes security software blocks the license validation service. Temporarily disable your firewall to see if Rhino can connect to the license server, then add an exclusion for Rhino.exe .
: Some antivirus programs flag Rhino’s licensing service as a "false positive" and quarantine or "patch" files it deems suspicious, breaking the validation chain. Corrupted License Cache : Old or mismatched license files in the %programdata% folders can cause Rhino to fail its integrity check. Outdated Licensing Service
If cost is prohibitive, consider:
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