Service Bus is only needed as a separate package if you don't want to use Connect ID SDKs. Otherwise, download the relevant package from "Connect ID SDKs" folder, they all contain Service Bus library.
Release notes of the Service Bus are part of release notes of the main package and can be found here.
fifa-connectservicebus-sdk-net-3.0.481.zip
Download / 2020-10-29 (Sprint 129)
fifa-connectservicebus-sdk-net-3.0.481.zip
Download / 2020-04-30 (Sprint 117)
fifa-connectservicebus-sdk-net-3.0.428.zip
Download / 2018-10-19 (Sprint 77)
fifa-connectservicebus-sdk-net-3.0.308.zip
Download / 2018-9-27 (Sprint 75)
fifa-connectservicebus-sdk-net-3.0.292.zip
fifa-connectservicebus-sdk-net-3.0.204.zip
fifa-connectservicebus-sdk-net-3.0.174.zip
Download / 2017-03-14 (Sprint 35)
fifa-connectservicebus-sdk-net-3.0.85.zip
Download / 2016-12-22