Dajzilla:

I didn't sell a MAX.

Yes you did!

Once a core or a "regular" is made a max it is a max forever, even if you sell it to someone.

Then, all the alorythms you've bought previously are still yours BUT

Read that page carefully: http://eventideplugins.elasticbeanstalk.com/h9maxout.html

It clearly says that "The MaxOut option
can only be used once – it's a one time deal. If you MaxOut and subsequently
sell your H9 Max, you will not be able to MaxOut another standard H9
or H9 Core."

LA