are open, as they are required for license activation and communication with the server. CSI Knowledge Base Are you using a standalone license server for your 2021 version? Licensing errors generated when running CSI software

(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)