Hi,

You have paid for a License when you purchased your Lenovo with Windows 10 preinstalled and that License is for Windows 10.

Your Windows 10 License does not entitle you to use a different operating system with the Windows 10 product key/license.

If you had Windows 10 Pro preinstalled you could have downgraded to 8.1 Pro.

https://www.microsoft.com/OEM/en/licensing/sblicensing/Pages/downgrade_rights.aspx#fbid=3NiMeh9yKRj

As you haven’t, you have to buy Windows 8/8.1.

Microsoft no longer sells Windows 8/8.1.

Try Amazon.com.

And support has ended for Windows 8 in Jan, 2016.

Cheers.

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