The issue in Obtainium is solved:
I deinstalled KeePassDX. It stayed in the Obtainium installed list (!) W.h.y. I found that in the Import/Export section in Obtainium there is a remark, (translated by me:)
'Imported apps may possibly be incorrectly displayed as 'not installed'. Just reïnstall via Obtainium, this should not influence app data'.
So I reïnstalled the app from downloads folder, and then let Obtainium reïnstall. 'Not installed' is now replaced by version number.
In general, myself I don't think a mismatch of App ID is possible if you allways use the right link from the source you downloaded the app in question in the first place, correct me if I'm wrong.
I have no clue what the difference is beteen the free and the libre apk. And I googled (starpaged) that for 20 minutes. I installed free.apk.
What is the difference? I use a Pixel 8 if that makes any difference.
Dumdum I believe its the link above where Latest and Installed Version is.
If in Obtainium in the apps list I click on the date then in the pop up it shows the link indeed. But no edit is possible, correct? It is easy to accidentally enter an assets-link instead of a project-link for instance, I think that will be static and not retrieve updates.