Sorry I don't have time to examine and test these missions right now, but I suspect they are broken in some way.
Some old missions were winnable in the game version they were designed for, but are unwinnable in later versions, and the Daidalos Team is not interested in updating them.
For example, the U-2 "Attack on Ryuhovskoe" mission is generally unwinnable in the current version because the AI aircraft do not hit enough targets to give the player a chance to achieve mission success. However, I think I remember the player having a small chance of success in an earlier version when the AI aircraft performed differently.
We just have to accept that some old missions are broken, while others age like fine wine!
If you want to be sure that you have missions matching your game version the best way is to download 3rd party missions from Mission4Today.com, or learn to fix the missions yourself.
