To install the plugin, you must first purchase it. Once purchased, visit your Downloadable Section of the Account page on the store and you'll be able to download the latest version of the plugin.
During installation, you'll be asked to provide a path. Please choose the location where your current installation of InControl is found. Failure to do this will result in the plugin not installing correctly. This is usually located at C:\Program Files (x86)\Moonlit Software, LLC\InControl HA.
For help on setting up your multi-user security, please visit the official help page.