FLStudio's plugin manager is not up to date with the latest versions of the SDK.
This was taken from the page "VST 3 Locations / Format" in the SDK documentation:
[quote]
On the Windows platform a VST 3 Plug ...
Does anybody know how to fix or is there a patch to the new update for Fruity Loops StudioMobile Windows 10 app version 3.1.943. The .wav rendering is not working ...