I originally posed this thread as a question, but I found the answer immediately when I installed my new plug-ins: I bought another copy of Movie Studio 17 Platinum to get the currently bundled BorisFX' Stylize Unit 2020.5 and NewBlue Elements 3 Overlay. I currently have VMS 17 installed from my suite purchase last week which included only the FXhome Intensity plug-in.
The new bundled FX license download-links were included my VMS activation e-mail and I was able to successfully install the plug-ins to my existing install of VMS 17 without a hitch!