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In order to avoid data loss issue or system revert issue, it's highly recommended for you to backup Windows 10 system and data before upgrade to Windows 10 Pro edition. Click "Start" to check errors on your partition. In the Check File System window, check the "Try to fix errors if found" option. Right-click the target partition that has a problem.
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How to upgrade Windows 10 from Home to Pro edition? Without a key? Don't know what are the differences between Windows Home and Pro edition? Below picture will give you a brief introduction.
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