Windows 10 was expected to be released on 29th July 2015. Microsoft officially announced "Windows 8.1 can be upgraded to Windows 10". Its Free !! This Limited time upgrade offer is for a full version of Windows 10, not a trial , 3GB Attachment required, Internet service fees may apply.
so what you're waiting for? Reserve your FREE upgrade now. Follow the Steps given below to upgrade to Windows 10.
Step 1 :
On your taskbar you can find a "Windows Icon" , If you find the Windows Icon it means your device is eligible to upgrade to Windows 10.
If you not find the Windows Icon on Taskbar don't worry install all the Windows Updates and Restart your PC.
To Install all Updates : Start -> Control Panel -> Windows Updates -> Install Updates
Step 2:
On Clicking on "Windows Icon" a window popup with a information about the Free Upgrade to Windows 10.
Step 3:
Click on "Reserve your Free Upgrade"
Step 4:
Enter your Email to get a confirmation Email once Windows 10 is ready to install.
Step 5:
All Done for Now ! There's nothing else you need to do. You'll get a notification on your PC or tablet when Windows 10 is ready for you.