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If the above fails, the driver is corrupted.
Before diving into fixes, understand the technical context. When you launch ETABS 2021, the software checks for a valid license in the following order:
Error 18 appears as a pop-up window stating: "A valid license could not be obtained by the application. Error code: 18" . In the context of 2021, this usually means: etabs license error 18 2021
If you are using a network license, the .lic file must explicitly reference the updated daemon path.
Open your .lic file in Notepad. Look for a line like:
VENDOR CSiBridgeDaemon "C:\Program Files\CSI\License Manager\CSiBridgeDaemon.exe" If the above fails, the driver is corrupted
For ETABS 2021, ensure:
The most reliable documentation comes directly from CSI. Here are the key resources: Error 18 appears as a pop-up window stating:
CSI License Manager Troubleshooting Guide
CSI Forum & Community Threads (2021)