double use on single computer

I have 2 ssd’s on my machine one with windows 7 and a second with XP I have avast installed and paid for on the win 7 drive.
Question : can I get a second copy on my XP drive without charge?
Thanks in anticipation T.

I’m fairly sure you would require a multi/ two user license to accomplish what your wanting to do, even though they would be on the same system it is effectively two installs.