That is not true.

For as long as only CSM is enabled (edit: pure CSM mode) Windows will install in Legacy BIOS mode.



You do not need to disable CSM if you have ASUS motherboard.

CSM...

You do not need to change the boot order of drives in your UEFI firmware settings.

https://technet.microsoft.com/fi-fi/library/hh825112.aspx?f=255&MSPPError=-2147217396

You do not need to disable Secure Boot if you install Windows 8/10 in UEFI mode.

EDIT:

The Asus motherboard default UEFI firmware settings.

Windows 8/10 64-bit will be able to be installed...

There is no need to buy another license.

Yes, because Windows 7 and Windows 10 are running on the same computer.

I have tested it on my computer, so it works very well.

No.



If you have an OEM computer with UEFI firmware embedded Windows 8/8.1 product key, the Windows 10 installer should automatically detect product key from UEFI firmware and you will be taken...

Select Drive options (advanced) to enable more options on the screen and delete all the partitions, install to the unallocated space and let Windows create the needed partitions.

You need to have a Windows 8/10 64-bit USB flash drive that is compatible with UEFI mode. As long as it is FAT32 formatted it should be UEFI bootable.

81279

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Select the following settings (marked with red color) in the Gigabyte UEFI BIOS if you want to install Windows 8/10 in UEFI mode.

OS Type or Windows 8/10 Features (look at the...