I am certain that I have bought 10 (excluding the ones that came with the unit and the looper. Actually paid for 10).
I looked up your account, and I see nine purchases that count toward the H9 Max upgrade. There's a 10th purchase of Looper, but that was free. If you think this is incorrect, please send an email to firstname.lastname@example.org as I don't want to go into the details of your account information on our forums.