If you have the Logitech G27 Gaming Wheel and want to be able to calibrate it using the official software, you need the Logitech Gaming Software version 5.10.127. You can download it from here. The page might auto detect your OS, but it might not present you with the proper version.
For 64-bit Windows:
- Click “Show All Downloads”
- Select “Windows 10” from the drop down
- Find the 15.3 MB file
- Click “Download Now”
- Run the file and follow on screen instruction