Input macOS high sierra or macOS Mojave in the Name field, select Mac OS X in the Type drop-down list, select Mac OS X(64-bit) in the Version drop-down list, then click the Next button. Open VirtualBox, click the New button to create a new virtual machine.2.1 Create macOS Virtual Machine In VirtualBox. Install Mac OS On VirtualBox Virtual Machine Steps. And after you install macOS high sierra in VirtualBox, you can upgrade your macOS to Mojave.Ģ. This step needs you to have a mac book pro, if you do not have one, you can download the mac os high sierra iso file, I only upload the high sierra iso file because my google drive does not have so many spaces. Whether you want to install mac os high sierra or Mojave, you should prepare the high sierra or Mojave iso file first, please read the article How To Download MacOS X High Sierra Installer In Mojave, How To Download macOS Mojave Installer And Convert To ISO File.First, you should install VirtualBox, this is very straightforward in windows, you can just download VirtualBox and install it.