Dave,
Several years ago the primary original programmer (he was a kid when it came out) starting working on an update but the project proved to be too daunting, far more than he thought. It turns out he studied computer science at the same place and time as the owner of FormZ. After help and pressure from the guy who wrote over 500 tools that we all use (WildTools by Alfred Scot) FormZ took over the development on condition that the original programmer be part of the update team. Originally, we expected a beta last winter but the difficulties, especially with ancient graphic APIs, has caused numerous delays. We were told 1 months ago that it is 80–85% complete and in the last few months the forum has become very active. Both FormZ and PCADD have both been posting progress and I keep my fingers crossed. I now have lots of software that I cannot use on my primary Mac due to being restricted to OS Mojave. I'll post here when more is known…
Ralph
btw PCAD is probably the fastest and easiest to use 2D program ever written and can produce incredible drawings, and I've tried almost all of them going back to ClarisCAD in 1985.