Today I will guide you How to upgrade Windows 8.1 to Windows 10 for free.
Condition
1. Your Windows 8.1 must have a license. If you use Windows 8.1 Pro and you haven’t Windows 8.1 pro key, you can buy it. I sell Windows 8.1 Pro key $25/key here: https://cheapproductkeys.com/
2. Your computer needs to meet the hardware requirements for Windows 10.
How to upgrade Windows 8.1 to Windows 10 for free
Step 1: You go here to download Windows 10 Media Creation Tool: https://www.microsoft.com/en-in/software-download/windows10
Step 2: You right-click the file you download and you select “run as administrator”
Step 3: You select Accept => “Upgrade this PC now” => Next
Step 4: You wait a moment for tool to download Windows 10
Then you click “Install”
Step 5: You wait until your Windows 10 installed
Done.