PLAYERS: If you are not looking to design but play custom campaigns all you need to do is install the add-on support package. Look for the entry labeled Left 4 Dead 2 - Add-on Support click and install it.
This download is sizable, but will update your L4D2 installation to allow running ANY map, including custom maps made for the original Left 4 Dead.
This fix required a change to the minimum spec from Mac OS 10.6.4 to Mac OS 10.7 (Lion) or higher, which matches Steam's minimum spec.
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DESIGNERS: Besides also downloading the above file you will need to download the Left 4 Dead 2 - Authoring Tools.In this case the possibility of malfunctioning or even damaging the game, which may necessitate reinstalling the game, is particularly high.Today we are releasing an Extended Mutation System for the L4D2 Beta program. - Configuration files are no longer loaded from addon vpks.These configuration values were sometimes used for malicious purposes, and all changes remained in the user's local settings even after the addon was disabled or removed.Among the most useful are: Gamemode Logic: Designers can now make a single map that can behave differently depending on the gamemode in which it is being played.