[signtool] How to install SignTool.exe for Windows 10

Best solution end of 2020:

Just download Windows 10 SDK from Microsoft here:
https://go.microsoft.com/fwlink/?LinkID=698771

In setup, choose only Windows App Certification App (it's only 120 MB)

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You can find signtool.exe here:
%PROGRAMFILES(X86)%\Windows Kits\10\bin\x64

Cheers!