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Microsoft has sunset the use of cross root certs for Kernel Mode signing. Developers must use the Microsof Developer Portal moving forward

For Windows 10 machines, drivers are required to be signed by an EV Code Signing Certificate

Common answers to code signing issues

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If they are using visual studio to develop the program, they have to sign with visual studio

When you are developing with VisualStudio manifest files are created that need to be signed. In order to sign them correctly you'll need to use VisualStudio in order to sign them correctly. I have attached a walk-through that will help you set up and sign your manifest and click once programs.