Uninstalled Avast

I bought and installed Avast before I realized that using windows 8.1 it was not needed. I uninstalled all but the sandbox (I think). Anyway, I am about to add 2 more computers to my network. Older machines that I have brought up to date. One an XP and one
with Vista. Since my account is still open I want to run Avast on the extra machines. Do I just bring the new machines on-line, go to the Avast site and type my code for downloads?

It seems to me you posted in the wrong forum.
This is for AES (business version).