@fdroidorg i removed the broken 142.0 instance from my phone keeping all data.
Then I accessed #fdroid via the app selected version 141.0.2 and selected "install". Guess what happened: the broken version 142.0 was installed馃槧
OK, uninstalled it again, downloaded the 141.0.2 and installed that via #adb .
Now the latest useable version is running. OK - I know the risks馃槷