Are you downloading it directly via the UPM? Otherwise you could download it directly from this page:
After that you should try to enter a valid license key (which isn't the SEN) Administration--> JIRA Agile--> License Details
Also, to clear this up, there is no such thing as a trial version of the software - all of the installs are the same. The difference is in the license key that you enter into the program, so if you're entering the trial license, it will be a trial, and if you enter your production license, it will not be. The license key is available in your account admin for each product that you have.
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