The only way to obtain the needed program manual for inVue Nxtrend 4.0 is through direct contact with the developers of the program. Their support page where the instruction sheets and other files is located displays a 404 error which means the resources are either moved, deleted or corrupted.
Access the following page and fill the form with your details explaining exactly what you need. Fill the form with real details so the response comes back to your email address.