An error occurred while signing: SignTool.exe not found

ClickOnce Publishing Tools are not installed as part of the Typical Installation Options. So you have to install it in advanced mode. 

This dialog can be found in Windows 7 by going to Control Panel > Uninstall a program, right-clicking on Microsoft Visual Studio Professional 2015 and selecting Change. A Visual Studio dialog will open up. Select Modify from the set of buttons at the bottom and the above dialog will appear.

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