Not so fresh when I look on the database but still reliable to learn the functions and for most of the approaches
One big plus, it's free. To run it, look in the menu and search for the icon with 2 gears, it should run both PFD and MFD together, if you run it manually, you won't be able to use the MFD (for me the most important thing on the G1000)
sportys.com / pilotshop / garminapp