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 ...
FLStudio as well as using my .Reg file. However I am prompted that "FLStudio will restart unlocked" only for me to run into the same issues again with my plugins. Strangely enough too, my apparent last ...