There is no information related to the license type of NimBUS Robot. From what I've seen based on the documents read and websites visited, I can say that the software is not free. This comes bundled with the NimBUS Server (a product offered by Nimsoft was acquired by CA Technologies in 2010). You will have to contact them in order to obtain additional information about downloads, availability, license type, etc.
Contact CA: https://www.ca.com/us/contact/call-me.aspx