Long time ago, i have bought a licence of Vaultwiki. But I had chosen the wrong version, not the one for XF.
I tried to reach anyone from the support, explained the situation and never got any answer.
I have also bought a version of EWR Carta and found some things to improve, done by own add-on, but unfortunately I never found any users who were interested in caring for it. I have deinstalled it.
Finally, I found out that the forum itself is the best place for me for almost everything.
I have understood after many years that the most users don't want a second, third, fourth area.