Right-click Setup_ETABS_18.1.1_Build_2148_x64.exe → Run as Administrator .
| Task | ETABS v18.0.3 (Build 1950) | ETABS v18.1.1 (Build 2148) | Improvement | | :--- | :--- | :--- | :--- | | | 45 seconds | 32 seconds | 28% faster | | Meshing Slabs | 28 seconds | 21 seconds | 25% faster | | Modal Analysis (20 modes) | 18 seconds | 14 seconds | 22% faster | | Nonlinear Static (Pushover) | 4 min 12 sec | 3 min 18 sec | 21% faster | | PDF Export (48 pages) | 22 seconds | 17 seconds | 23% faster | CSI ETABS Ultimate 18.1.1 Build 2148 -x64- -Fil...
Uninstall older ETABS 18.0.x or 18.1.0 via Windows Settings. Retain the database files but remove program files. Right-click Setup_ETABS_18
