Just to let everyone know, there seems to have been a "silent update" of v10: https://www.ritlabs.com/en/products/thebat/archive-versions.php

Version 10.5.4 is available there, dated January 4. No "what's new" information, probably some bug fixes. The last version I remember before v11 was 10.5.3.2.

EDIT: just installed it, no what's new information in readme.txt either. The bug with empty forwarded messages seems to have been fixed (if I remember correctly, it was present in 10.5.3.2).