How to use AVG VPN on multiple devices?

I run AVG Internet Security - Unlimited with three PCs and two Android devices. My previous subscription was for the Zen variety. Back then I could see and deal with all five devices from my base PC. Now I can see only the three PCs on my PC machines. I can invite the Androids and set up AVG such that they each declare they are on AVG Security Pro, but that does not feed back to my base PC.

I believe that AVG VPN can be active on only one device at a time, but I read on this forum that there must be a different paid subscription for the Android devices and for the PCs. Does that mean I should be able to enable VPN on one Android and one of the PCs, or can only one of the five devices run VPN at once?
I have VPN active on one Android device as a paid one year subscription registered to one email address. I cannot enable it on the second Android device on the same email account address. VPN is installed as a 30-day free trial on the three PCs, but the "enable" switch does not work. I have not found any way to create a separate subscription for these PCs.
I believe customers are floundering because there does not appear to be any comprehensive instruction set to use all these various AVG features. Maybe AVG has not written them down yet? 
Furthermore it appears that the AVG PC group and the AVG Android group do not talk to one another. I don't think they like each other very much! That is my multi-year experience.