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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.
You can call up the Force Quit menu from the Apple icon in the upper-left corner or by hitting Command-Option-Escape. Just highlight the app that's not responding and hit the Force Quit button.
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When Windows 10 is not activated, the Personalization page of the Settings app looks like this:
It prevents you from changing the Desktop wallpaper. But there is a trick which you can use to bypass this limitation.
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:
There you will find some subfolders which store all Windows 10 wallpapers:
Once you find the suitable image, just right click it and choose Set as desktop background from the context menu. The image will be set as your desktop background ignoring the fact that Windows 10 is not activated.
Option two. Use Internet Explorer.
Open Internet Explorer:
Go to your favorite wallpapers web site or just Google the desired image.
Open it and then right click it in Internet Explorer.
In the context menu, select Set as background:The image will be set as your wallpaper after a confirmation:
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:
Tip: You can subscribe to Winaero at YouTube.
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Your Mac asks you to enter the name and password of an administrator account when it needs to verify that you have permission to make changes. For example, you must authenticate as an administrator when you click the lock in System Preferences, enter certain commands in Terminal, or set a firmware password.
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The password of the administrator account should not be blank. Your Mac might not accept a blank password, even if the account is using a blank password.
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