: In some cases, the error occurs because the computer lacks a valid UUID. To check this, open the Command Prompt and run: wmic csproduct get uuid . If the output is FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF , the software may not be able to lock the license to your machine. Clean Reinstallation : Uninstall ETABS 2016 and any related Sentinel drivers. Reboot your machine to clear temporary registry entries.

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