I couldn't find a user guide for the CImage DMDesktop software on the websites that I've searched or through Google Search. There isn't even a website to get in touch with developer to request it.
As for the ImageMaster, there are multiple applications with the same name. Because of this, I recommend checking the following link which will lead you to the Google Search. Between the results list, you'll see various versions of the ImageMaster. Identify the correct one and then contact its developers for additional resource: https://goo.gl/sm3X64