Within the page they provide you with the operating systems but it is different from what I know, since it is a .rar, and there are no instructions on how to boot it into memory
Make sure you have prepared following before you install the original Windows operating system:
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write down your Windows license key, in case the system gets corrupted, using a Windows cmd instruction, so you can re-enter it manually if needed
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install on usb using rufus the iso file you downloaded from the microsoft site. Don’t use the chuwi site, as it is not clean like from Microsoft
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install on a second usb and unrar the file using 7-zip into a directory the drivers. Go to support.chuwi.com to download the drivers. You will need this to install the drivers after you installed windows, as there will be a lot of missing drivers
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prepare a usb mouse, as during the installation and after, the trackpad will not work due to a missing driver
If you don’t understand what I mean, please google for more information.
Good luck!
Check this
Windows installation tutorial: windows installation system tutorial
Driver installation tutorial: Driver installation tutorial