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Since most Windows based computers come with Windows installed, if you want to replace it with this retail product (and I can only think of a few unusual reasons why you would want to do that), you will have to buy a retail version per computer. Mostly people buy this if they build their own PC which doesn't come with Windows. If you had Windows 10 and it won't let you upgrade, buying this won't help you because the computer hardware itself isn't able to run the newer version.
Sorry, there was a problem. Please try again later.You can't it only has one and you would have to spend an additional 150 bucks to get one which the one I bought couldn't be used buy at your own risk once you buy it you can't get your money back if it's the wrong item or doesn't work!
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