Problem

My ViaCAD/Shark installer will not launch on my MAC with Sierra OSX 10.12

Solution

Open your download folder and locate the .DMG file for the product.  Right click or CTRL + Click on the file and select open. You will get a warning dialog with a button that allows you to open. 

You may need to do the same to launch it the first time after install, but instead of the download folder, you would repeat the process on the App in the applications folder.