If you previously installed an evaluation or trial version of ETABS, hidden remnants can block authenticated user profiles.
This error essentially means that the Licensing Service (usually the Computers and Structures, Inc. (CSI) License Manager ) cannot communicate with your license file or server. Before you panic and reinstall everything, know that this is a common issue with a straightforward fix.
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Before diving into the fix, it helps to understand why this happens. Error 120 generally pops up when:
Reboot your machine to clear the temporary system registry cache. If you previously installed an evaluation or trial
If you are using a network license where ETABS pulls a license from a central server, your computer might be "remembering" an old server IP address that is no longer valid.
The "ETABS License Not Recognized Error 120" is a common and disruptive issue that prevents Computers and Structures, Inc. (CSI) software from validating its authorization credentials. This error typically signifies a communication breakdown between the ETABS application and the Sentinel RMS License Manager, or an issue with the local license file itself. Before you panic and reinstall everything, know that
Restart ETABS. If you have a valid internet connection and a digital license, it may automatically recreate a clean file. Phase 3: Resolving Network License Issues