You will then be required to make a replacement virtual machine and install macOS Sierra Nevada on VirtualBox.
During this computer, you will be required to download and install the VirtualBox software and download the macOS Sierra Nevada Final image file.
To enjoy this you would like a 64-bit computer that has a minimum of 4GB RAM. This may install the Sierra Nevada Final as an application that runs within Windows. For those on Windows, you’ll use this macOS by using VirtualBox.