Welcome! Hope this site can be of some assistance!
Yes, I strongly believe MIDIDesigner Pro is a great investment, not just for the Venom or any other synth, but for a variety of other instances with some creativity and thinking outside the box.
As far as Windows goes, I’m actually a Mac guy myself, but if you happen to be a member of the Venom Facebook page (https://www.facebook.com/groups/m.audio.venom/), it looks like under the files section there’s a couple of files (Venom_Installer_WIN64_ 1_0_13_Driver 5_10_… and VyzexVenom1.20_WIN.rar) that MIGHT(?) be of assistance.
Please report back if they do help, and thanks for joining!