Four Computers, 3 Windows and an iMac

Hello Dennis,
You can download AVG program in all your 4 computers using the provided license number if you buy it for 4 computers. I request you to contact us using the below link http://avgread.me/1G2aa9F  to help you with the purchase and installation. Please be sure that we are here to help you, if you face any issue with AVG. Please do not hesitate to contact us .
Thank you.

I want to know if I buy a 2 year plan for four computers will I be able to download for both systems on a plan.

Hello Dennis,
You can download AVG program in all your 4 computers using the provided license number if you buy it for 4 computers. I request you to contact us using the below link http://avgread.me/1G2aa9F  to help you with the purchase and installation. Please be sure that we are here to help you, if you face any issue with AVG. Please do not hesitate to contact us .
Thank you.