Open File Explorer and double click on your DVD drive.
If necessary, double click on the "setup.exe" file which is in this Windows 10 installation DVD.
Click "Yes" when the "User Account Control" window appears.
The message "Preparing" appears.
In the Windows 10 installation wizard that appears, click on the "Change how Windows Setup downloads updates" link.
Note: if you want to know more about the Windows 10 upgrade process, refer to our "Upgrade Windows 10 to newer version of Win 10 (from DVD)" tutorial.
Select "Not now" to prevent Windows 10 from trying to download drivers from the Internet (which is not available on your virtual machine) and click Next.
Your PC is checked.
Accept the Windows 10 License Agreement.
Normally, Windows 10 Upgrade Assistant will let you keep your personal files and apps.
But, there is a special case where it does not work by default.
In this case, this will be displayed.
To fix this issue, you just need to download update KB4586853 for your current version of Windows 10 and install it.
Note: to transfer the downloaded "windows10.0-kb4586853-xXX_...msu" file:
Once the update is installed, you will need to restart your virtual machine.
More information on this problem in our tutorial: Upgrade Windows 10 - Fix v20H1 to v20H2 issue.
Relaunch the installation wizard from the Windows 10 installation DVD and this time, the "Ready to install" step will appear with the messages:
Windows 10 upgrade starts in full screen.
The upgrade continues after a 1st reboot.
When the upgrade is complete, launch the "winver.exe" program.
As you can see, we are now at version 21H1.
Now that your virtual machine has been upgraded, shut down your virtual machine.
Your virtual machine is powered off.
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