V11 is legacy software. It is designed for Windows XP and Windows 7 (32-bit or 64-bit). It is generally unstable on Windows 10 or 11.
You are maintaining older SIMATIC S7-1200 controllers that cannot be upgraded to firmware v4.0 (which requires TIA Portal V13 or higher).
Download the specific package files for your software tier (Basic or Professional). How to Install TIA Portal V11 SP2 Update 3
(STEP 7 Basic/Professional and/or WinCC Basic/Comfort/Advanced/Professional) already installed before applying Update 3. How to Download and Install Update 3 for TIA Portal V11 SP2 - SiePortal - Siemens
1 Apr 2026 — Is TIA Portal V17 compatible with Windows 11? Siemens officially supports Windows 10 only. Industrial Monitor Direct SIMATIC STEP 7 (TIA Portal) V11 SP2 TRIAL Download - ID