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See these two documents
E-UPG Best Practices for a Tools Only Upgrade [ID 831453.1]
E-CA: Cannot Load Upgrade Template into Change Assistant - Everything is Greyed Out [ID 647870.1]
You don't really need to set up your EM hub for doing a tools upgrade. But as part of your tools upgrade your EM Hub and agents has to get upgraded.
So I would suggest you to proceed with the tools upgrade. Setting up EM in change assistant is something which is not required for the tools upgrade.