Aviatek does not provide G1000 software. Our G1000 is recognised as an external display for your PC. You need a 3rd party software to display on the screen.
We highly recommend the default X-Plane 11 G1000 which is already built-in in the flight simulator. Another great option is the G1000 NXi in the MSFS 2020 by Working Title. For Prepar3D we recommend using Mindstar G1000.