If you are using a TwinCAT 3 license dongle, you may experience issues with local activation on Windows 11, particularly if your TwinCAT 4024 build is older than 4024.66. 3. Step-by-Step: Setting Up TwinCAT 4024 on Windows 11

Windows 11 enables Virtualization-Based Security (VBS) and Hyper-V by default, which can steal resources from the TwinCAT real-time kernel, leading to jitter or runtime crashes. 2.2. Licensing Issues (Dongles)

Always check the TwinCAT 3 Release Notes for the exact minimum build number required for your Windows 11 patch level.

Windows 11 loves Hyper-V. TwinCAT hates sharing the CPU with Hyper-V. If you get a "TwinCAT is not running in Real-Time mode" error: