Once Windows 10 is installed but not activated, the user cannot change personalization options. They are locked until Windows 10 is activated. Until then, it is not possible to use Personalization to change the desktop background image. Here is a workaround.
When Windows 10 is not activated, the Personalization page of the Settings app looks like this:
How to change Windows 10 desktop wallpaper without activation
There are at least two ways to bypass this limitation and set the desired image as your Desktop background. You need to do the following.
Option one. Use File Explorer.
Open File Explorer and navigate to the folder where you store your wallpapers.
Tip: If you want to access stock Windows 10 wallpapers, they are located in the following folder:
Open it and then right click it in Internet Explorer.
Using this easy trick, you can easily change the desktop background image in non-activated Windows 10.
Watch the following video to see this trick in action:
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