Why do you think a timeout is a certificate issue? If it were me, I'd look at traffic to/from the https proxy. I'd guess that the proxy does not forward an https connection it cannot establish itself (since it does not have the necessary certificate).
In any case, you can always downlaod the tarball yourself and run the installer manually see the instructions on the download page for reverting to a earlier calibre release.
Last edited by kovidgoyal; 12-13-2014 at 01:55 AM.
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