Which version should I need to install on my MAC?

miaomiao

Bit poster
I was bought 6 before 7 release, and I've got free upgrade to 7.

Here is my question...
Each time when I install PD7, I have to confirm twice with two serial number of different version.
First I need to keyin PD7 serial then keyin PD6 serial, then well done.

Now, I wonder which version of PD8 should I need?
Can I buy upgrade version to PD8?
Or I have to buy new one?

If I buy upgrade version, Have I to keyin and confirm three times serial number(PD6,PD7,PD8)?
 
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