Can't open the dmg file

I downloaded the Parallel Studio 2016 dmg file from the official website and double clicked it, a window poped up to access the authority, I clicked ok. The icon then disappeared from the dock bar. Nothing happened. I don't know what's going wrong.

My system is Mac OS X 10.11.1. The XCODE edition is 7.1.

An old Parallel Studio 2015 is in the system but failed to work since upgrade of Xcode.

I want to know how to open the new Parallel Studio 2016 dmg file and setup it to the system.