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 ...
Hi,
Wanted to give the share feature a try today. Fired up 12.4 and can't find the FLM plugin.
Was hoping [url=https://www.youtube.com/watch?v=5dYBwoQeFuk:6c79si2t]your video[/url:6c79si2t]could help me ...