The manual download includes almost everything out of the box (big book, keyboard overlay, technical supplement) plus a good-sized 3rd party strategy guide that I've never seen before. However, the original game also came with some useful color maps of the theatres that are missing from the GOG version. Just FYI. The game is still playable without them.

True, same here on GOG for me. My copy from Steam also does not include the maps. Fortunately for me I still have my original box copies for C64, Amiga and PC from which I do still have the physical copies.

However, you can get usable copies from here:

https://www.oldgames.sk/en/game/f-19-stealth-fighter/docs/

They also have a couple of box front-cover scans.

Hope that works out okay for folks!

-Matt in Seattle (mwirkk)

{Note: This info I've previously cross-posted on another thread on the Steam forums: https://steamcommunity.com/app/347250/discussions/0/1742268065070339472/#c2565312097214014089 }