can't install on mbp with os 10.11.5

i’m trying to upgrade element 7 to pro 9. before purchase that i tried to install element 7 to a new macbook pro (os 10.11.5) but it shows “you need at least os 10.5”.
anyone has an idea? thanx!

10.11 was not on the list of known OSX, when WaveLab Elements 7 was released.