Siko
Sorry to say I don't remember your last postings, but from the sound of it you (or your relative) have (had) something to do with Austria.
If so, I suggest you make contact with ÖFH (they have a contact link here
https://www.oefh.at/impressum )
I was a member for many years, but left because instead of focusing on the big picture the magazine dealt too much on small individual things which was of minor interest to me. With me, living in Sweden, it proved impossible to attend any meetings etc, so I called it a day...
So my decision had nothing to do with any thinking the Society is bad in any way, since they indeed have a large number of really good historians among them!
Hopefully they can provide either direct information or tell you where to track down further details.
Cheers
Stig