upgrade 5 - 7

RomanCB

Bit poster
In december 2009 I bought Parallels 4 with the option to upgrade to version 5. Since 2010 I used parallels 5.
Today I bought the upgrade to version 7 but cannot activate this.
Using the old activation key, the activation fails. I think it is because the activation key was for parallels 4, but i upgraded from 5 to 7.
how can this be solved?
thx
 
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