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 ...
need to install FL new (version in title) and looks like this version doesn't accept my old Harmor anymore:
[attachment=0] har.jpg [/attachment]
Can somebody comfirm that? Is there really no chance to use the old pixel versions anymore? :-( ...