If the license file appears corrupt (Error 110/30), you may need to re-activate:
ETABS 2016 looks for the license file in two distinct directories. Placing it in both eliminates pathing errors.
Have you recently or changed your hardware components ?
ETABS 2016 is a finite element-based software used for structural analysis and design. It is widely used by structural engineers and architects to model, analyze, and design buildings, bridges, and other structures. The software requires a valid license to operate, and sometimes, users may encounter licensing issues, including the "License Not Recognized" error.