If you already own a license dongle or serial number for ETABS 2013, you can download the original installer from archive sources:
: Older versions like 2013 may not be fully compatible with modern operating systems like Windows 11. Why Use ETABS 2013?
ETABS 2013 was a landmark release for structural engineers, introducing a major graphical overhaul and transitioning to a physical object-based modeling environment. :