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Click on "About" in the bottom left of the menu bar. It will then display the patch version of the system.
GSB 160 - is the latest version for 4.3. This last patch contains the fix for ShellShock. There should be another patch being released soon for the GHOST exploit - CVE-2015-0235 aka "GHOST" glibc gethostbyname buffer overflow vulnerability
Refer to: How To: Download and Patch the 4.3 Cloud Service Appliance Manually for the patch version codes and how to manually update the system.
I would highly recommended patching your system via the manual method above and then opening a support ticket to try to get the download patch content issue resolved. It may be that you do not have port 80 open in your firewall settings.
Hope this helps,