Is it possible still to upgrade from win 8 to win 8.1

I have problem in my computer. I am using win 8.1. I want to clean install 8.1. I do not have win 8.1 sofware. How to go about. I have upgraded from win7 to win8 and then from win8 to win8.1.
I have my product key for win8. Can anybody suggest what can I do now.

Tks,
Menon

Hello Menon, and welcome to Eight Forums.

If this is retail copy of Windows 8, then you are good to go and could do either option below.

OPTION ONE:

1. Clean install Windows 8. - http://www.eightforums.com/tutorials/13375-clean-install-windows-8-upgrade.html

2. Update to Windows 8.1. - http://www.eightforums.com/tutorials/32995-windows-8-1-update-windows-8-a.html


OPTION TWO:

1. Use Option One in the tutorial below to download a Windows 8.1 ISO file with your Windows 8 key.
2. Create a bootable USB/DVD from the ISO file.

3. Clean install Windows 8.1 with a generic key. When the installation is finished, change the product key to your Windows 8 key to activate it.


Hope this helps,
Shawn