Go to your software page....click the '20' or '40' link
See where you can go with those links.
Works fine for me.
I click next it shows 40 & 60
go back to first page
Click 40 and it shows 40 & 80
Click 40 and it shows 60 & 120
Ok, so the first one works just fine. The 2nd doubles whatever the first one is.