Chrome Extension Will Not Install: CRX_FILE_NOT_READABLE

Just installed Chrome 15.0.874.121, and tried to install extension 3.8.7, but failed. Tried again with 3.8.8.38803. Received following error message on both attempts: "Package is invalid: 'CRX_FILE_NOT_READABLE'."
Any helpful advice would be greatly appreciated.
Thank you very much.

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