Go to your LIBRARY where all the ADD ONS you have installed are viewable. In there you can use the search box and type 787-10. You’ll see the FS2020 787-10 available for download and it will replace the FS2024 version. Then after it’s installed the sim will ask you to restart the game and when you enter back into the sim, you’ll see the FS2020 787-10 installed. Having it installed will let you use the 788.
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