So long with no updates, the forum seems dead. Emailed them awhile back about the program, response was: still alive. I hope so it's a great firewall.
W10FC got stuck end of 2021 https://www.tapatalk.com/groups/vistafirewallcontrol/the-latest-betas-releases-t6.html it is installed for win10 on two machines, on two machines with win11 it is not, there is no need to, the defender firewall is tough enough. maybe less income for reason to develop it further, anyhow it works on a current win10, it should work on current win 11. at least there exist better stand alone solutions.
Most current version is 8.4.0.84. I believe Sphinx is alive and well. When people post questions on the forum the posts are answered quickly. It will be updated when some posts indicate the need for updates. Most firewalls don't need any updating unless they contain stuff like ad blockers, content monitoring, HIPS ... A while back there was a nice discussion thread started by our own Bellgamin which you may wish to review: https://www.tapatalk.com/groups/vistafirewallcontrol/tested-for-windows-11-t730.html SRT, why don't you go on their forum and ask about the current status and plans?