Here the solution (in german):
https://youtu.be/WUod8EpGGf0?si=LVf4QIlecUTX4ABE
Go to the Community Folder and add there a new folder named microsoft-airport-eddm-munich
Then copy the content of the folder simwings-airport-eddm-munich into this folder. That’s it.
With the help of JayDee’s video, I have now at least managed to install my purchased EDDM, TNCM and LPMA.
Using EDDM as an example: Go to the community folder and add a new folder called microsoft-airport-eddm-munich (exactly the same name as in the StreamedPackages folder —> %LOCALAPPDATA%\Packages\Microsoft.Limitless_8wekyb3d8bbwe\LocalState\StreamedPackages)
Then copy the contents of the simwings-airport-eddm-munich folder into this folder. That’s it.
However, this method does not work for some airports (for me). For EDDF and EHAM I had to create an empty folder in the community folder with the name of the streamed airport (for EDDF: asobo-airport-eddf-frankfurt | for EHAM: asobo-airport-eham-amsterdam). And then create a new folder in the community folder with the purchased airport (or the one I got from flightsim.to). In my case this was “EDDF virtualFRA” and “EHAM Amsterdam Airport”. The empty folders in the community deactivate the original MS/Asobo airports. The newly created airports “EDDF virtualFRA” and “EHAM Amsterdam Airport” are then loaded.