To update your ESX using esxupdate, here is a very useful guide to follow for installing patches:
As for the ehe "Invalid patch bundle" error:
During the installation process, esxupdate validates each bundle by using a set of signature keys. The bundle.zip files, contents.zip files, and all files in a bundle contain VMware signature keys.
If a patch contains a missing or invalid signature, esxupdate does not consider the bundle for installation.
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If you found this information useful, please consider awarding points for "Correct" or "Helpful". Thanks!