Buy X get Y Multiplied

Hi
I have set up buy 4 products get one free. Which works fine, but if they order 8, they should get 2 free, not 1. How can I set up so every 4 they purchase they get 1 free?
Thanks

Hello,

Leave the maximum discount qty blank:

Hi

I did that but did not work. Hikashop

Nevermind - Started working now.. Thanks