The links to the node.js server and client applications are in the post here.
However, if you are looking to program the switch hardware (e.g. Change its hardware settings), that is not possible with this software. This is for integration to Hubitat, but it cannot do the Insteon hardware configuration.
A couple of options for setting Insteon hardware configurations are:
1. The Home Assistant integration can change settings for Insteon hardware.
2. A subscription to the Insteon Connected Home Access will allow you to change the device settings, and then you can cancel the subscription once the hardware is configured the way you want.
3. Configure the devices right at the switch by following the instructions provided by Insteon.
