How to upgrade Win10 system without formatting C drive

Win10 system installation is nominally upgraded from Win7, Win8, but in fact it is also reinstalling the system, reinstall the system to format the C drive. So is there any way to upgrade Win10 without formatting the C drive?

Do not format the C drive upgrade Win10 method

The first step, we download the ISO image file format Win10, and then extract the files;

The second step, Open the unzipped folder, find and double-click to run Setup.exe and follow the prompts. However, it is recommended to try to install Win10 with a local account. After the installation is complete, go to Microsoft users. Select the bottom left corner of the installation. Do not use Microsoft. Account login system (not recommended) & rdquo;, regardless of Microsoft recommendations are not recommended.

The above is not to format the C drive to upgrade Win10 method, use this method to upgrade, C drive will not be lost.