Slitherine

On my Air M2 I managed to get both PzC and PzC2 working on Steam.
OS Sonoma14.2.1

Unfortunately installing PzC2 broke PzC.

The install needs an auth code but otherwise free.

Can provide details if interested.

Wow! Could you share more details on the setup process?

Go to the Porting Kit web site.
https://www.portingkit.com/download
Download and install.
Open the PortingKit app, search for 'Steam'
Download the option for 'M2 and Sonoma'
Open steam app, log in, and install PzC2.
So worked, a very clean and easy install.

There are 3 SteamBuild options, I only tried the one best suited for me.

I have 24GB of RAM, PzC2 is resource heavy and Apple Silicon does not have/use Vram. See PzC2 requirements.
I have PzC1, PzC2, and Steam running on a windows laptop so did not need to authorize anything new.
PzC1 appears to be running now, I may have tried to open a saved game for a DLC I don't have authorized on Steam.

I have not tried the Slitherline install because it seems to do a full install for each update/DLC, and I am lazy.
This works on Mac Studio and MacBook Pro M3 38 GB RAM.