I checked the official website for this application, but there is no manual listed as being available. There are some manuals on Google, but they're related to DIMMER only, and the most important part is missing.
Use the following contact details to reach the developers to ask them a manual file:
General Information: info@LeiderdorpInstruments.nl
Customer Service: support@LeiderdorpInstruments.nl
Later Edit: After additional search I have found the support for Light Interaction, as they seem to be in business with Liagro: