Win10 to restore to Win8 can not find the original ISO image?

After many users used Win10, they felt unsatisfied and wanted to restore to the old system. An ASUS Taiji user 21 wants to use the original Win8 system ISO to recover, but did not find it, so it is very distressing.

The specific situation is:
He installed the Win10 preview and found that he did not adapt to his touch screen notebook, so I want to restore it back. However, the ISO file downloaded from his website is not the original one. His computer is ASUS Taiji Ben 21, and it is worried that the use of non-original ISO will have an impact.
Solutions
The original computer should come with a system disk. If you need to install a genuine system, you can use this installation disk for system installation. If there is no requirement for genuine, download a Win8 or Win8.1 ISO file from the Internet to install the system. The system and device model have no relationship, no matter what computer you are, you can use the ISO for system installation.
Windows is a compatible machine system with a wide range of applications. So, no matter what brand of computer you are using, you can basically install the ISO image of the Windows system.