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The toolkit works on Linux systems only. However, even if you cannot use the HA toolkit directly (due to a different operating system or because of site-specific requirements), you are likely to benefit from learning how the toolkit works, since it can provide a model for your own scripts and processes.
You can download the HA toolkit from the following GitHub link: https://github.com/Appdynamics/HA-toolkit.
In an HA deployment, the HA toolkit on one Controller host needs to be able to interact with the other Controller host. The toolkit relies on certain conditions in the environment to support this interaction, along with the other operations it performs.