And if I said the only way I will provide Finalwriter for aos4 is if aos4 users pay for both the development and then a copy how would I look?
Honestly, if you own the rights; do as you like. Noone should hold a grudge over it.
As it is, everyone intrested in the ORIGINAL version of FW will find it by searching the net.
Its been "dead" for years, just like AeonKits aquisitions, so I cant bring myself to villify someone trying to modernize anicent products.
That said; im sure you would make several people happy if you ported to all "Amiga" branches.