When you install Windows 8.1, Windows 8.1 will ask you Windows 8.1 setup key. You can find Windows 8.1 setup key here.
You can download Windows 8.1 iso from Microsoft here: https://www.microsoft.com/en-us/software-download/windows8iso
When you install Windows 8.1, Windows will ask installation key, you type these keys below
Windows 8.1 setup key
- Windows 8.1 Pro installation key: XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB
- Windows 8.1 installation key: 334NH-RXG76-64THK-C7CKG-D3VPT
- Windows 8.1 Enterprise installation key: MNDGV-M6PKV-DV4DR-CYY8X-2YRXH
- Windows 8 Pro with Media Center installation key: GBFNG-2X3TC-8R27F-RMKYB-JK7QT
After you install Windows 8.1, you buy Windows 8.1 product key to activate it here ($25/key): https://taloshop.xyz/ban/product-category/windows-8-1-product-key/
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