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The newest version of EndNote is X8. Select the Buy link above to upgrade.
If you have already purchased X8 and need to download it again, go to this Knowledge Base article. The most current versions are X8.0.1 for Windows® and X8 for Macintosh®.
Get the latest update to X8 featuring a fix that enables searching within the PDF viewer again.
(released March 14 2017)
In EndNote X8, under the "Help" menu, choose "Check for Updates...".
If you want to install the X8.0.1 update manually, read this Knowledge Base article.