>>14646299
The only way to get PosChengband now (that I'm aware of) is to get a fork of the original version:
https://github.com/NickMcConnell/poschengband/network/members
At a glance, most are several years old, some (like PEPCB) are based on 6.1.0, and only one (carriercomm / poschengband) appears to be based on the latest version, 7.0.2.
As to what happened, I don't know the details, but from the vague mentions of him I've seen while looking through threads on angband.oook.cz for info about various things, the dev was apparently the type to do something like this.