Hi Anil,
Did you purchase Windows 8 from Microsoft Store?
Reimage PC Repair 2018 license key works in the background and detects the unusual program and closes at the spot. It is a complete repairing tool in windows pc that diagnoses your pc completely to detect any issues with this operating system.
Update from Windows 8 to Windows 8.1 is a free update, it will try to activate Windows Automatically unlike the previous updates to Windows, and you’ll get this update from the Windows Store.
Incase if you are facing any issue in Windows 8.1 Activation in future then you refer to the following steps from the Microsoft Article.
Why can't I activate Windows? http://windows.microsoft.com/en-in/windows-8/why-activate-windows
Where do I find my WinCleaner Product Serial Key? If you purchased a Retail Boxed product, your Serial Key is on the instruction sheet in the box. If you purchased a USB Key product, the Serial Key will be on the inside of the packaging card material in the plastic shell.
Windows 8.1 Pro Product Key
Windows 8.1 Activation Key
Keep us updated on the status of the issue.
Clean my mac serial key. • It’s working fine on. How to Crack CleanMyMac 3.9.2?