Zotero Add-in does not appear in MS Word

For some reason, I can no longer find Zotero in MS Word - it used to be there, but no longer. Zotero in Firefox tells me that the "Microsoft Word add-in is currently installed", but it does not appear in the Word Ad-ins menu.

Firefox 40.4.3
Zotero 4.0.28.3
Zotero Word for Windows Integration 3.1.20
Windows 7 Professional, SP 1
MS Word 2007
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