How to downgrade program v10 has to many issues 
Autor: Tyson M.
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i upgraded to v 10 but do not like it but i tried to install v9 but my key no longer works? any suggestions?
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I think this may give you the answer. http://answers.websitex5.com/post/58014
Hello Tyson,
With the upgrade of the licence from Version 9 to Version 10 you cannot install Version 9 because the licence is now valid for Version 10.
Can you please tell me what issues you are experiencing?
Many thanks!