Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.
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Microsoft Windows 8.1 Pro Pack (Win 8.1 to Win 8.1 Pro Upgrade) - Key Card - Price:$254.99 read all the steps
https://www.amazon.com/Microsoft-Windows-8-1-Pack-Upgrade/product-reviews/B00EDSI7K0
as you run windows 8.1 pro now why dont you have it already?
If it is available and if you’ve already purchased the Windows Media Center Pack for Windows 8.1 Pro.
Quote
Add Windows 8.1 Pro Pack or Windows 8.1 Media Center Pack to your edition of Windows 8.1
Swipe in from the right edge of the screen, and then tap Search.
(If you're using a mouse, point to the upper-right corner of the screen, and then click Search.)
Enter add features in the search box, and then tap or click Settings.
Tap or click Add features to Windows 8.1 and then do one of the following:
If you need to purchase a product key, tap or click I want to buy a product key online.
Follow the steps to purchase and enter a product key.
If you already have a product key, tap or click I already have a product key.
Enter your product key and click Next.
Read the license terms, select the check box to accept the license terms, and then click Add features.
If you were running Windows 8.1, your PC will restart automatically and Windows 8.1 Pro with Media Center will be available for use.
If you were running Windows 8.1 Pro, your PC will restart automatically and Windows Media Center will be available for use.
* To install Windows 8.1 Pro Pack, you must be running Windows 8.1; to install Windows 8.1 Media Center Pack, you must be running Windows 8.1 Pro. Internet access fees may apply. Prices shown are estimated retail prices; actual price may vary. Additional hardware may be required to watch and record live TV with Windows Media Center. Terms and conditions.
If you purchase a new PC with an edition of Windows 8.1 preinstalled and you later upgrade that PC with Windows 8.1 Pro Pack, Windows 8.1 Media Center Pack, a volume license edition, or a retail edition, you will no longer be able to install apps that are provided exclusively from your PC manufacturer through the Windows Store.
Source
http://www.asus.com/au/support/FAQ/1005433/
This may help, wiki hw to install WMC
http://www.wikihow.com/Download-Windows-Media-Center
source from MS
Windows 8 and 8.1 Pro Pack and Media Pack are no longer available to buy
As of October 30, 2015, the Windows 8 and 8.1 Pro Pack (which upgraded Windows 8 Home or 8.1 Home to Windows 8 Pro or 8.1 Pro, with Media Center) and Media Pack (which added Media Center to Windows 8 Pro or 8.1 Pro) are no longer available for purchase from Microsoft.
Previously purchased feature pack licenses will still work, and valid feature packs may still be available for purchase from third-party retailers.
Support for these products is still available.
these days there is the apps
My Media Center
https://www.microsoft.com/en-us/store/p/my-media-center/9wzdncrdmrn8
free
MC Media Center
https://www.microsoft.com/en-us/store/p/mc-media-center/9wzdncrdqj67