You will need to be able to obtain the definitions/binaries for vCenter Protect as well as any patch files that are required for applying patches.
The best way is to have a separate console that is online. Then you can just manually copy the files over.
Otherwise this KB article may be helpful:
http://kb.vmware.com/kb/2008384
It will also help to review the following Help article within Protect:
Help > Contents> Managing Multiple Consoles> Disconnected Console Configuration> What is a Disconnected Console Configuration?