Downgrading
I somehow installed the beta version of zotero and I can't find the macword integration for this version. I tried deleting this version to install the previous version of zotero and I keep getting a pop up that says, 'my library is using a newer version of zotero and I need to upgrade'. How do I completely remove this beta version from my computer?
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has both links to the plugin and instructions for reverting to 2.0
http://www.zotero.org/support/zotero_data -
(that's linked to from the downgrading instructions, too).
But the problem at this point is with the word integration - you don't need to delete any of the files you mention. If your database opens in Zotero 2.0.9 you did everything right with the downgrade.
If you don't see Zotero in that menu, reinstall the Word for Mac plugin for Zotero 2.0.