Butler makes it both easier to develop Qlik Sense apps and run client-managed Qlik Sense clusters.
This page gives you the general steps to get started with Butler.
It also explains how Butler relates to and uses other tools and services.
How to install Butler, including requirements and on what platforms Butler can be installed.
Everything you wanted to know about Butler configuration but never dared to ask.
Options for running Butler.
Upgrading from one version of Butler to another is usually quite straightforward.
This page describes the upgrade process.