Are all automation campaign versions live?

Automation campaign versions are active when there are contacts active in any stage of an automation flow.

New entries (or contacts entering a campaign flow by an entry trigger), will only enter the latest published version - so the current version is live by default.

Previous campaign versions can't accept new entries, but contacts that were already midway through the flow of a previous version do not exit automatically - these flows will continue to have active contacts until all contacts exit.

You can still access previous campaign versions to see your performance statistics and flow structure, but you can't revert to a previous version.