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).
Thanks for that tip. I hope to move forward with v11 some day but nice to have an alternate/backup. For me, 11.0.3 just made things worse. Opened a ticket with illustrations that speak for themselves. I guess we're actually just in Beta