I’ve seen this problem increasingly often with the latest version (24) of Google Chrome. Â It happens when trying to install an extension from the Chrome Web Store — and nothing seems to correct it.
An error has occurred
Download was not a CRX
So, what’s the solution? Â Visit the Chrome Web Store from within Incognito Mode, then install the extension from there. Â Problem solved! Â (Or, at least sidestepped anyway.)