Some people are thinking about downloading the whole new Windows 10 or buy it but here I will give the tutorial for directly update your Windows 8/8.1 to Windows 10. you don't have to download any third party software to download this update.
Only you have to follow 3 steps-
- Enable Automatic Update
- Launch Command Prompt in Administrator Mode
- Enter the wuauclt.exe/updatenow command and hit ENTER KEY.
Now wait for the download to complete and follow the instructions that will pop out in your screen after the download.