I manually updated it (thanks to Warzen for making me aware).
I have only testing it locally through hosting, will check on our dedi server later today.
So you need to take the two files that come with the compatibility pack, found in: C:\Program Files (x86)\Steam\steamapps\common\Arma 3!Workshop@ACRE2 S.O.G. Prairie Fire Compatibility\addons
Copy and past them into: C:\Program Files (x86)\Steam\steamapps\common\Arma 3!Workshop@ACRE2\addons
Then only run ACRE2 in the mod list (no need to run the compatibility mod)