JIRA 6.3.11 is the latest version of JIRA (it was released this week). JIRA 6.4 is still on milestone version (before beta) and can be downloaded from https://www.atlassian.com/software/jira/download-eap.
That being said, I'd advise you to download JIRA 6.3.11 as it is the latest stable version. You can see JIRA 6.3 docs on https://confluence.atlassian.com/display/JIRA063.
I hope this helps!
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