NodeNow Portable

Run Start-NodeNow.bat first.

Start-NodeNow.bat checks whether Microsoft Visual C++ Runtime is installed.
If vcruntime140_1.dll is missing, it runs redist\vc_redist.x64.exe and then
starts NodeNow.exe.

If Windows asks for permission when proxy/TUN starts, that is the helper
service registration prompt. It can appear on a fresh PC or portable run
because there is no installer step to pre-register the service.
