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 ...
Hello .
I opened an old project but it doesn't open some on my vst-plugins true that i`m sure they are installed and working great.
[attachment=0:2xjzmugj]< >z3ta.swf< >[/attachment:2xjzmugj] ...
FL 12.5.59 [b:3dkypsax]32bit[/b:3dkypsax] does not find any VST plugin when opening a project.
It looks like it happens with any project made on my previous PC (So all projects except my last).
The VST's are installed ...