Hello Andreas,

good news: We were able to install the app, later in the day we will bring it to our live system. Your post brought the success, changing the App Store reference inside the AP Platform settings did it. I wanted to let you know what our problem was: We misunderstood the functionality of the App Store App. It is meant to only aggregate all the resources (own apps and foreign app store apps) and to choose from these resources what apps should be part of the own app store.

PS: After updating our App from 13r1 to 13r2 there was no build-release.bat file present (which is clear, since it probably arises when creating through the new template). I copied the .bat file from a new project and will modify it so it fit our app project (i think only a few folder references needs to be adjusted)