09-02-2017 08:43 AM
So that the Community can help you better, we need to know exactly which app you're trying to install along with which operating system is running on your computer (i.e. Windows or Mac OS, and which version thereof). That, and any other details you'd like to give will help the Community better understand your issue!
If this is a time-sensitive matter, search our knowledge base or contact our US-based technical support team at http://canon.us/SupportCF
Thanks and have a great day!
09-02-2017 05:43 PM
Are you getting confused by the tartup screen which says "ver. 4."? What does the Help>.About Digital Photo Professional say?