First install uTorrent if you haven't already go it installed ([Only registered and activated users can see links. ])
Add these 2 torrents using the Magnet links (File > Add Torrent from URL).
Windows 8.1 United Kingdom x64 Pro VL DVD (3.63GB)
This is the clean Volume Licensing Version that requires a KMS server to activate it. There is a very good reason for this.
Copy & Paste it into uTorrent======================================================Code:magnet:?xt=urn:btih:0E10D17032876A1A55382E2A0D4ED89461863F14
Microsoft Toolkit from CODYQX4. (35.6Mb)
Software able to create a KMS Server periodically on your PC to activate Volume Licensed software ONLY (including MS Office 2013, Windows Server 2012 R2 etc.)
Copy & Paste it into uTorrent======================================================Code:magnet:?xt=urn:btih:3D4DA8157777C8D68DCF0C8BAEA590651BF8FFCE&dn=Microsoft%20Toolkit%202.5%20BETA%205%20Official%20Torrent&tr=udp%3a%2f%2ftracker.publicbt.com%3a80%2fannounce&tr=udp%3a%2f%2ftracker.istole.it%3a80%2fannounce&tr=udp%3a%2f%2ftracker.openbittorrent.com%3a80%2fannounce
Once both downloaded, create a Windws USB Drive installer using this -
[Only registered and activated users can see links. ] I find this one the most reliable and easiest to use.
NOTE: Use a USB Drive of at least 8gb in size.
If you prefer, you can burn the ISO to a DVD and install that way. Installation will NOT ask for a CD Key.
Extract Microsoft Toolkit from the Zip and copy it to a/the USB Drive (needed for activation after install!)
Install Windows 8. Wait til the whole install has finished and you're in Windows 8.1 (No need to update the Service Pack etc).
Once Tiles has loaded, load the Desktop from Tiles and right Click the folder Icon and navigate to the USB and the Microsoft Toolkit.exe file you downloaded previously.
Along the status bar of this program you'll notice Office and Windows Logos. Click the Windows one, no prizes for guessing what the Office one will do.
Then click 'Activation' then 'EZ-Activator'. You might get a Firewall warning, just accept this and wait for Windows 8.1 to be activated.
In the console, It'll say something like Product Activated. Only usually takes about 15 seconds.
Right click the Windows 8.1 Start Button and Click System. Windows 8.1 should report its activated.
Save USB for a later date to install the same way on any PC you wish in the future.
Happy Windows 8.1 'ing.