Upgrading from Pro Tools 8

I have been using PT8 on my MAC OS 10.6.8 computer :



Now I work on a new computer running on MAC OS 10.8.5, on which I cannot install PT8 :



What I understand from reading trough the AVID pages, is that I would need PT9 installed on my new machine in order to download PT10/PT11 upgrade, but I never had PT9….



So now, how can I install PT10/PT11 on my new machine without paying full price product ? I never found upgrade information from 8 to 10/11…