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I have disable my firewall and it still comes up with the Communication error. I skimmed through these forums and nearly tried everything and it still hasn't worked.
I would recommend that you try downloading your product using the virtual assistant by following the directions here:
http://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/How-to-...
Or you can try to download the trial.