Search:

https://https://i.imgur.com/SavNyYe.jpg

https://i.imgur.com/bAzWemg.png

http://www.sim-outhouse.com/sohforums/attachment.php?attachmentid=73950&stc=1http://www.sim-outhouse.com/sohforums/attachment.php?attachmentid=73951&stc=1

"Now what I want to know is how you guys installed the Real Air"

Real Air have a Prepar3d installer for their Spitfire.

https://realairsimulations.net/