Just checked the prealpha website (http://mysticbbs.com/downloads/prealpha/) and was able to see it. If anyone is looking for it, it appears to be available.

ogg
Sysop, Altair IV BBS
altairiv.ddns.net:2323

... Reward for a job well done: More work

--- Mystic BBS v1.12 A48 2022/07/15 (Windows/64)
* Origin: Altair IV BBS (21:2/147)