Since XenServer 6.2.0, Citrix has made all of the features available for free; however to receive support one must purchase a license. I was always under the impression you could not update XenServer 6.2.0 because it is always disabled through XenCenter but today I found out you can just apply the updates manually.
Copy the update files to your XenServer via your preferred method or use wget to download them directly. Next run the following command:
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xe patch-upload file-name=<path to your update file> |
After this command finishes, it will output the uuid of the patch you just uploaded; on my system I could just tab complete the uuids in the next command:
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xe patch-apply uuid=<uuid of uploaded patch> host-uuid=<uuid of your XenServer> |
Reboot your XenServer and the patching is complete.