If the error persists, you can try to "clean" the licensing state:
(or standalone) instead of "Network License" if you do not have a dedicated license server. Apply License Fixes as Administrator Navigate to the ETABS installation folder (typically C:\Program Files\Computers and Structures\ETABS 2021 Locate the licensing utility or activator and Run as Administrator Ensure the generated license file ( ) is present in both the main installation folder and the CSiLicensing subfolder. Environment Variable Configuration (for Network Users) etabs license error 18 2021
: ETABS 2021 (v21.x.x) Common symptoms : If the error persists, you can try to
For persistent issues, you can generate a locking code using Wechoid.exe (found in the installation's CSiLicensing folder) and contact CSI Technical Support for a manual license refresh. CSiLicensing tool path on your machine or instructions for deactivating a current license? Licensing errors generated when running CSI software CSiLicensing tool path on your machine or instructions
Create a plain text file named LMHOST.INI in the ETABS installation folder. Inside, type the IP address or name of the license server. This helps the software bypass network discovery issues. ✅ Summary