FLStudio, and I've created a separate folder for my 64 bit plugins (in this case, Kontakt). I've added them into my list without any trouble - if I create a new project and add the plugin, it adds ...
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 ...