How to Install my Anti Virus Real time threat protection on my second device?

Hello Spring,
From your account, I see that you have purchased AVG Antivirus for three Windows computers. I have sent you an email instruction, please follow the instruction to download/install/activate AVG Antivirus on your second and third computers.
Best regards,
Alok.

I bought the AntiVirus (Real Time threat protection) last week. The box list for 3PCs, I installed it on one PC already, but I don't know how to install it on second and third one? please help!
thanks,

Hello Spring,
From your account, I see that you have purchased AVG Antivirus for three Windows computers. I have sent you an email instruction, please follow the instruction to download/install/activate AVG Antivirus on your second and third computers.
Best regards,
Alok.