Question: how to change windows 10 os in laptop?
Answer: Step 1: Make sure your computer is eligible for Windows 10. Windows 10 is free for anyone running the latest version of Windows 7, Windows 8 and Windows 8.1 on their laptop, desktop or tablet computer. ... 
Step 2: Back up your computer. ... 
Step 3: Update your current Windows version. ... 
Step 4: Wait for the Windows 10 prompt.