Microsoft says the ESU program is "not intended as a long-term solution but rather as a temporary bridge to stay secure while one migrates to a newer, supported platform."  Windows security ...
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 ...
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 ...