you need to order the upgrade from cisco as you will need valid licensing to convert. Starting with version 5.X licensing is enforced in the software.
You need a valid contract with CISCO to order the upgrade. Once you order it they will ship you the software you need.
did you use the product update tool to order the upgrade?
You should have had an option to check which upgrades you want and order them by quantity. It takes a few weeks to receive them usually.
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