Error #18 (and related Error #20) can occur if the computer’s date is incorrect or if the license was issued for a specific timeframe that the system clock is no longer matching.
[Current Date] Target Audience: Structural Engineers, CAD/BIM Managers, IT Support in Engineering Firms Software Version: ETABS (Version 18 / 2021 Release) etabs license error 18 2021
: Run a Command Prompt as administrator and execute ngen uninstall ETABS to remove potentially corrupt .NET native images. Error #18 (and related Error #20) can occur
A: Student licenses in 2021 rely on a virtual license file. Error 18 here usually means the student license expired, or Windows Defender quarantined the license generator. Re-download the student license file and re-run the setup.exe as admin. etabs license error 18 2021