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 ...
Essentially, I don't know how to change the plugins I bought from trial version to the full versions. I bought the Signature Bundle and a few of the plugins/VST changed from their trial versions to the actual full version ...