Hi Jason,
The campaign client and the server are installed separately.
To gain access to Adobe Support portal, you need to be part of a partner organization or part of customer organization that has bought the Adobe Campaign license. You have to raise a ticket to campaign support team and they will provide you the latest setup files for server and client.
Client Installation:
The client installation is simple and you can do it on your side irrespective of whether you are on an on-premise architecture or an Adobe hosted architecture.
Server Installation:
If you are an Adobe hosted customer, then you have to reach out to the campaign support team to get your server upgraded.
If you are an on-premise customer, then you have to get the setup file from campaign support team and perform the installation on your side.
Documentation:
You can follow the below documentation for more details.
Adobe Campaign Implementation Guide
Also, the new version 18.10 update - Build 8977 has both the client and the server setup file.
Hope this helps.
Thanks,
Prajwal Shetty