I have Fmod Studio 1.08.05 and UE 4.12.3 AND I am unable to use them together. I downloaded the plugin but i think that maybe it’s not in the folder where it should be. I’m using a Mac, where should the plugin folder be added?
The plugin can be placed in either the UE4 Engine/Plugins directory, or in a Plugins directory under your UE4 game.
This page has some info about where it goes, including what it looks like in Finder: