Free up to 20GB of Hard Drive Space on Windows 10

Microsoft released an update for Windows 10 and users that installed it noticed a loss of up to 20GB of hard drive space.
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That's because Windows 10 keeps the old system files so that if you want to go back to the previous version you'll be able to.
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But if you have a small size hard drive and you're running short on space you can delete those files and reclaim up to 20GB of free space.
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