If you don't see either the Zotero Word for Mac/Windows Integration or Zotero LibreOffice Integration in the Extensions window, then you should re-download and re-install Zotero.
If the Enable button for the Zotero Word for Mac/Windows Integration is grayed out so that you're unable to click on it, click on the Remove button and then restart Zotero. If either the Zotero Word for Mac/Windows Integration or Zotero LibreOffice Integration is disabled, click on the Enable button to re-enable the extension. 
In Zotero, go to Tools → Add-ons → Extensions. If the Zotero thread/toolbar (or the Zotero scripts menu in Word 2008/2011 for Mac) doesn't appear, follow these steps:
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