The other day I got my Moog Subsequent 37 and I first installed the editor (I’m on Windows 10) , made a firmware update and explored bank 1.
After a lot of fun, I tried the VST editor but got a message
The editor cannot connect to the hardware. Please connect your subsequent 37 and set MIDI In and Out on Setup page.
The editor worked fine stand alone and I had a lot of fun playing around.
But then I wanted to add the editor as a VST to Propellerheads Reason.
When I opened the VST, I got a message it could not connect to the hardware and I needed to go to the settings page to select the right midi device.
Now I knew it should work (because it did stand alone), but I could not figure out what to do to solve it.
The Subsequent CV was present on the setup page of the editor, but nothing worked.
I found out that I had to install the (new) midi driver from Moog and after that the problem was gone.
https://www.moogmusic.com/downloads under editors.