Drop your issue into the support team, using the web-form on the Unity site. Give them your serial number, your the exact email address you've used for your Unity account. They can then help you out. If you've used the Pro trial before, then it's not possible to use it a second time. Also, a lot of the Pro features are now part of the 5.x free version, so using 4.6 is a bit pointless.
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