Manually set your computer date back to when the software was installed (e.g., set it back to 2015 or 2016).
If you suspect a 1.5.-18 PLIST error, this is your primary solution. sap2000 license not recognized error 18 extra quality
Many system-level issues can be resolved by performing a "clean" uninstall and reinstall, which removes all traces of the old installation before setting up a new one. Manually set your computer date back to when
(important for crack-based installations to prevent automatic updates/verification). Uninstall SAP2000. Delete any remaining folders in Program Files . sap2000 license not recognized error 18 extra quality