So I recently purchased the Razer Blade after years of being in the Mac ecosystem. Being a privacy nutcase, I installed my trusty expressVPN app only to get an error stating that the TAP driver is not digitally signed and can therefore not be installed.
No amount of research into alternatives (PPTP dialer is not secure) and using the OpenVPN connect client caused DNS leaks galore. Finally, I reached out to their support and they pointed me towards an older version of their app, which you can download here. Yes, it DID fix my issue.
So rather than bang your head against a wall, do what I do and use an older version of expressVPN if you’re on Windows 10.