> Lots of bug reported in the 3.4x;
> very few have been fixed by Xavier.

That is disappointing.  For you, too: you are investing so much time
investigating bug claims and helping people.
(Makes me almost understand your famous grumpy tone! :-) )

Do you recommend reverting to an older version?  If so, which one?
And HtTrack is open source, isn't it?  Is no-one else working with the
sources?