If you need ETABS 20.3 specifically (e.g., for compatibility with an existing project or course materials), contact directly — they may provide an older version if you already hold a valid license. Otherwise, use the latest trial or explore free alternatives.
: More granular control over tabular results and shell force/stress contouring. Minimum System Requirements etabs 20.3 download
Installing v20.3 will not uninstall older major versions (like v18 or v19), so you can keep both on one machine. If you need ETABS 20