If installing on Windows, please not that you'll probably get a warning that it's from an unknown developer. Click "More info" and "Run anyway". I'll fix this in a later version.
Once it's installed, you'll need to configure it on the Settings page. Most important here is to ensure the IP address of your inverter is correct. Currently only Omnik inverters are supported. You can find the IP address on the display of the inverter by toggling the display mode. See this helpful YouTube video for how: https://www.youtube.com/watch?v=aZPkxaGghF4