FLStudio.
I re-run the plugin scanner, and it showed error on the Valhalla Room and d16 Group's Lush-101 plugins.
I un-installed and re-installed them, but the same story...!
I tested with VSTHost app, and these ...
FL 20.5, build 1142.
In the video it for some reason doesn't show the add plugins menu at the end, where I try and select Sylenth and Serum and nothing happens, and then I try another vst and it opens ...