Relay Upgrade to 9.5.13

I’m upgrading my relays from 9.2.15 to 9.5.13. Do I upgrade the Client first than the Agent?

Also where would I find the config file [if any] where someone has daisy chain relay to the BES root server?

We just used the supplied relay upgrade fixlet (all our relays are Windows server OS) and it upgraded both client & relay.

Thank you, just read up on it!