Thanks for that idea with the AqBanking importer.
I tried it and it does the same. It can read the old file format but not the new.
I messaged my bank and they say all should be fine. They done extensive testing and all the customers (except me) are happy and it’s working.
I suppose the alternative is to use QIF or CSV format instead.
I remember using that in the past but somehow it was always lacking some details or something. It wasn’t as good as OFX format. Well, give these other formats another go then.