It was pretty hard to find notes on this so I am posting in case it helps someone else.

Warhammer 40k Rogue Trader works perfectly with Mac M1 systems (with at least 16gig ram)


Notes:
-I haven't tested Galaxy install but I can if you want (let me know)

-the manual install works. (I am using Sonoma MacOS 14.1.2) and had to use preferences to tell MacOS to install it anyway as the file I received wasn't properly signed. (I can document this if you need).

-the manual install asks for a directory and says it will run a script- its not really clear but whatever you choose it makes a folder and that's where the game is installed. The install process takes a good while and dont close anything while it's running. Later you can go to that directory and run the game.

-have had a few hours of play time. No issues with anything and no crashes.

-the DLC was downloaded and installed separately. So far I can see at least the ship.

Let me know if people want me to test anything.

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Edit... am using Heroic Launcher to manage / update this and it works great. No issues with Save files to date. Have uninstalled and re-installed a few times for various reasons and had no issues.
Heroic work significantly better than Galaxy (slow/buggy/would never close)