There are a lot of practical reasons to set up an OS like Windows 10 in a VM rather than using it as a native installation. If you have to deal with files you can't trust, need to test multiple OS ...

At this point, your computer will exit Windows and enter the OS installer, which could take some time. It'll restart a few times during this process, which is normal. If all goes well -- and it should ...

Windows 10 KB5071959 is an out-of-band update rolling out to all PCs that are not part of Extended Security Updates (ESU).