I´m not the reator of UP and don´t have any informations about what´s included and what´s removed, i can´t see behind the scenes, so together with others like vampire_pilot who offered his help, i´m only digging ... After countless hours of trials and error since release from UP 3RC i´m faintly looking for informations, i see that again (like it was with the update from UP 1.8 to 2.0) a lot of planes are gone. That´s a great problem for campaign builders, even if there were good reasons for doing it. Downwards compatibility should be a must. UP was always a mod pack for offliners and offliners need campaigns. Now the situation has grown worser with the changes of the loadouts for the 109´s, that means that also some stock campaigns for stock IL2 will have problems.
Don´t take i as an offense, but one readme file for one of my dgen campaigns is larger than the readme of UP yet. I know that it is a lot of work, but what i (or we all) need is more documentation. And communication with all the people who are adding things to UP.