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There is no distinct trial version, you're downloading the fully functional version. There is no license key. The error you've received suggests that the file was not completely downloaded, or the archive (.ZIP) was not fully or correctly extracted. Try to extract the archive again to a new location. As a result, you should see a number of folders and files in the new folder location. If you only see files, the folders in the archive were not extracted properly.
I hope this helps.