An error occurred while signing: SignTool.exe not found

While I was trying to Update my Project I was making - I got an error for the first time I've seen:

'An error occurred while signing: SignTool.exe not found.'

I've never seen this before, So I looked up that SignTool.exe is what signs my project for ClickOnce Deployment.

I also read that is it a part of Windows SDK - but when I looked to find where SignTool.exe is - I saw it right there!

  C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin

I saw no problem, and I've always published my Project all the time - I'm on Version 68. But this is the first time I've seen this - I didn't touch any options that would do this.

Any help?

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.

Please Click Once application --> Properties --> Signing -> Unchecked the Sign the ClickOnce manifests.

Problem will be solved.

Note: Be aware that this solution removes security from your project. Seek assitance from a more learned colleague before doing so.