So I recently downloaded my 4th DLC aircraft, and now I'm being told to run the installer and update the game because it can't find the file 'Cessna 172SP' and that it's needed for the tutorial. First off, that isn't true. When I look in the "Aircraft' then 'Laminar Research' folder, it clearly shows it with all of its files intact. Another strange thing is that it lets me open the 172 in the plane maker thingy, so it CLEARLY is working. The only mod that could have affected it is the Reality Expansion Pack from the .org store, but it was running fine before. The aircraft I just installed was the C404 Titan (also from the .org store). Do you have a fix?