Guess vB 4 was released after the release of vB 3.8.4 but before the release of 3.8.4 PL1
You might want to perform a quick search on the Announcements forum at vBulletin.com to check what I said (faster) or you can open a vBulletin support ticket if you believe that there is something wrong with your account and its abilities to download the latest version of vB that you believe you're entitled to use (slow response time).
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