Installing on multiple devices

I purchased the Internet Security program for multiple devices several months ago but have only gotten around to installing it on my main, desktop Mac. I'd like to add it to my laptop and, assuming it's compatible, to a couple of mobile devices. I believe I asked for help on this earlier but didn't follow up, so I would appreciate detailed instructions or a link to a help article on how to do this. This may not be relevant, but I was just looking on the main site after signing in and it says I don't have any subscriptions, while I would assume I do since I purchased the upgrade from the basic free program. There was some confusion at the time of purchase between two email addresses, but I thought that was resolved.

Hi Nancy.
We'd be glad to help you with installing AVG on other devices.
I have sent an email containing detailed instructions on how to do that. Please check your inbox and spam box as well.
Your active subscription is not visible when you login to AVG MyAccount because of the change in registered email address.
I assure this won't be an issue with installing or activating AVG on other devices.

Hi Nancy.
We'd be glad to help you with installing AVG on other devices.
I have sent an email containing detailed instructions on how to do that. Please check your inbox and spam box as well.
Your active subscription is not visible when you login to AVG MyAccount because of the change in registered email address.
I assure this won't be an issue with installing or activating AVG on other devices.