I've been following it closely... even though I purchased Jonathan Williamson's RetopoFlow, this appears to have features RFlow doesn't. The developer has stop active work on it now ( to prevent burnout and to spend more time with his daughter, Mira, who the tool is dedicated to) but I warrant that if bugs turn up he'll be around to manage them.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks