I’m afraid I haven’t been able to reproduce this issue, which makes me suspect I must be missing some vital step of your process. Are you sure that the version of the Unity integration you’re using matches that of the version of FMOD Studio in which your FMOD Studio project was created and built?
I get the same error, see below ::
FMOD Studio: Encounterd Error: ERR_VERSION The version number of this file format is not supported.
FMODUnity.EditorUtils:CheckResult(RESULT) (at Assets/Plugins/FMOD/src/Editor/EditorUtils.cs:25)
FMODUnity.EventManager:UpdateCache() (at Assets/Plugins/FMOD/src/Editor/EventManager.cs:157)
FMODUnity.EventManager:RefreshBanks() (at Assets/Plugins/FMOD/src/Editor/EventManager.cs:37)
FMODUnity.EventManager:Update() (at Assets/Plugins/FMOD/src/Editor/EventManager.cs:683)
UnityEditor.EditorApplication:Internal_CallUpdateFunctions() (at /Users/bokken/buildslave/unity/build/Editor/Mono/EditorApplication.cs:332)