The internet is riddled with cracked or malicious files claiming to be a "free KNX Virtual download." Do not use them. The official KNX Association provides a legitimate, fully functional virtual environment directly to users.
Here is the step-by-step process for a safe, legal download. knx virtual download
You can run a KNX visualization software (like Gira X1 or Home Assistant) on the same PC. Point the Visu to 127.0.0.1:3671. The Visu will think it is talking to a real IP router, but it is actually talking to your ETS Demo. This allows you to design full dashboards for free. The internet is riddled with cracked or malicious
Run Node-RED locally. Install the node-red-contrib-knx-ultimate node. Connect it to your KNX Virtual interface. You can now write JavaScript functions to manipulate your virtual bus, simulating complex logic like weather-dependent shading or presence simulation. This is the magic of the KNX Virtual download
Inside ETS, open the "Group Monitor" (Tools > Bus Monitor). Start the monitor.
This is the magic of the KNX Virtual download. You can test logical sequences, debug timing issues, and practice troubleshooting without a single screw terminal.