One of the major changes to Windows 8, was the removal of Windows Media Center which was available for free in Windows 7. Windows Media Center is available as a paid upgrade to Windows 8 Pro and you need to buy a license for this. Windows Media Center was made available for free for Windows 8 release preview versions. With the release of Windows 8 on October 26th, Microsoft has made available a limited time upgrade offer for Windows 7 users for $39.99. Now, Microsoft has made available the Windows Media Center Pack free of cost for all Windows 8 Pro users for a limited time.
If your PC is running Windows 8 Pro and you’d like to get Windows 8 Media Center Pack so you can watch and record live TV with Windows Media Center, you can take advantage of the following special offer. This offer is only available from October 26th 2012 to Jan 31st 2013. You qualify for this promotion if your PC is running Windows 8 Pro.
You must provide a valid email address to receive your Windows 8 Media Center Pack product key. Your product key must be activated no later than January 31, 2013. The license can be used to activate up to 5 PCs, so probably you can use multiple email IDs to get licences if you have more PCs.
Once you have got the license key, you can install the Windows Media center pack using this tutorial.
Claim your free Windows Media Center pack from here.