Set the FOV at runtime.
I have updated the addon, it should now work on 389. Please do consider moving to regular Z axis because this addon is now deprecated and I will probably not prioritize updating it in the future.
Also, with Addon SDK v2, this addon will not be ported to the new SDK so it will stop workin in about a year.
If you want the Set FOV action in vanilla C3 to work in normalised axis, please file a feature request for it, because the only reason it doesn't work in vanilla C3 is it actively does a check against it.
Its too late to change from Normalized z axis to Regular. Thank you very much works perfectly now !