I got it running on macOS 10.14.6 (Mojave) and it probably works for higher versions of macOS as well (?).
[7 Days to Die Alpha 20.5 (b2) and Undead Legacy 2.5.82]
Just started the game, generated a new world (which took quiet long and close to the end I thought the game may had crashed, but it didn't - so be VERY patient!) and looked at my surroundings for like 15 seconds.
So, following these steps gets you at least to that point. Anything after that ... you have to find out yourself
Installing Undead Legacy
1. Download Undead Legacy and open the UndeadLegacy folder afterwards.
2. Open your 7 Days to Die folder (user/Library/Application Support/Steam/SteamApps/common/7 Days to Die).
2.1 Make a backup of your current Mods folder!
3.
Move the following files and folders from the UndeadLegacy folder to your 7 Days to Die folder:
BepInEx
doorstep_config.ini
doorstep_libs
Mods
run_bepinex.sh
4. Right-click on the 7DaysToDie application, press and hold the Command key and choose "Show Package Contents".
5.
Copy following files and folders from the 7 Days to Die folder to the 7DaysToDie application:
Mods
serverconfig.xml
6. Open the Terminal application.
7. Copy & paste this and hit enter: cd Library/Application\ Support/Steam/SteamApps/common/7\ Days\ To\ Die
8. Copy & paste this and hit enter: chmod u+x run_bepinex.sh
9. You have successfuly installed Undead Legacy.
Starting Undead Legacy
1. Open the Terminal application.
2. Copy & paste this and hit enter: cd Library/Application\ Support/Steam/SteamApps/common/7\ Days\ To\ Die
3. Copy & paste this and hit enter: ./run_bepinex.sh
3.1 It may take a few moments till the game starts.
3.2 Don't close the Terminal window as long as the game runs.
4. Have fun.
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