Use license bought for Windows on Mac

Hi
I bought 3 licenses for my old windows computer and now I have a Mac. I just downloaded Avast Secruity and I can’t find a place to put in my license code. It says on the website that it’s still active, so there shouldn’t be a problem with it.

Can I use the license on Mac or is it only for Windows?

Hope someone can help me as I’d like to use what I’ve paid for.

Nope, it’s Windows only.