get vcpkg (c/++ package installer/builder)
git clone https://github.com/microsoft/vcpkg
checkout vcpkg commit e6c6d9621 to get protobuf version 3012001
cd ./vcpkg && git checkout e6c6d9621
run this to download/build vcpkg.exe
.\vcpkg\bootstrap-vcpkg.bat
install/build protobuf for x64, default is x86(!)