Click on "Downloads" → "ETABS" from the top menu.
Go to https://support.csiamerica.com and log in with your username/password. (If you forgot your credentials, use "Forgot Password"—do not create a new account.) download etabs 18
ETABS 18.1.0 and later versions support running multiple independent load cases on separate processors to speed up analysis for large models. Click on "Downloads" → "ETABS" from the top menu