chrome zotero-connector corrupted? (Mac)

I'm trying to install the Chrome extension to go with the stand-alone, and after downloading the zotero connection from the website it cannot be installed. Clicking on the .crx will fail with "CRX_MAGIC_NUMBER_INVALID" on the yellow warning bar in Chrome itself.

This is on Mac OSX 10.7.5, running Chrome 23.0.1271.101. I have my Zotero installing in my home folder instead of where it normally sits.
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