If both computers are connected to the SuperHub, then you don't need to spend any money on anything else. You have all the hardware you need. Normally all you'd need to make sure is that the Homegroup is set up
https://support.microsoft.com/en-us/...tart-to-finish
As a VPN is designed to hide network traffic from other devices, it could well impact the ability to share between the two computers depending on how it's set up.