How to install macOS Big Sur on windows 10 PC / laptop via VirtualBox using macOS bootable ISO.Steps to install Apple Mac OS:1. Download & Install VirtualBox. During this step, we will need to have the macOS Big Sur ISO file available. If you haven’t already downloaded it, click here to get it. First, open VirtualBox and select the newly created install macOS Big Sur virtual machine on the left, then click the ‘Start’ button at the top. Start macOS Big Sur in VirtualBox image. But does not prevent the VirtualBox developers from updating the product so it works on beta releases of Big Sur, and make that available - also as a beta release - so that all of us, early testers of Big Sur, can give feedback on VirtualBox too. The ultimate goal is that VirtualBox works out-of-the box with Big Sur the day it comes out. How to install macOS Big Sur on windows 10 PC / laptop via VirtualBox using macOS bootable ISO.Steps to install Apple Mac OS:1. Download & Install VirtualBox.