Step 1: Download 8.1 ISO
Step 2: Burn ISO or download http://www.microsoftstore.com/store/...usbdvd_dwnTool to create a bootable USB Install.
Step 3: Place USB or DVD into a computer
Step 4: Boot from the USB/DVD (Normally F12 but look for boot menu option)
Step 5: Continue to install like normal and when asked for a serial enter one of the following (DO NOT ENTER YOUR OWN)
For Windows 8.1 Core 334NH-RXG76-64THK-C7CKG-D3VPT
For Windows 8.1 Professional XHQ8N-C3MCJ-RQXB6-WCHYG-C9WKB
Step 6: When you reach the desktop you will notice you are not activated this is fine! Right click the start button and choose "Command Prompt (admin)"
Step 7: Enter slmgr.vbs -ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (Replace the Green X's with your RETAIL Windows 8 key)
Step 8: Restart PC once the box comes up saying "success"
Step 9: If when you restart you are not activated right click the start menu and choose "command prompt (admin)"
Step 10: Pull out network / router cable / disconnect from WIFI
Step 11: Type slui 4 in the command prompt
Step 12: Click "activate by phone"
Step 13: Select "United Kingdom"
Step 14: Ring the number given using skype or normal phone (free with skype)
Step 15: Follow what it says (you will be told to press 1 then #)
Step 16: Enter the long code from Windows 8.1
Step 17: When asked how many computers is this installed on choose 1
Step 18: Enter the code given.
Step 19: Click Activate or OK on Window.
Step 20: Restart PC and done.
THIS WILL NOT WORK ON ENTERPRISE IT WILL ONLY WORK ON THE PRO/CORE ISO. IT WILL WORK ON X86 AND X64. THIS WILL ALSO ONLY WORK FOR RETAIL KEYS IT WILL NOT WORK WITH A MAK OR KMS KEY.
PLEASE STOP ASKING FOR KMS ACTIVATION WINDOWS 8 USED KMSV5 8.1 USES KMSV6 WE NEED A NEW KMS KEY FOR KMS TO WORK AND THIS WILL BE SOME TIME (WEEKS OR MONTHS NOT HOURS OR DAYS.) YOUR MAK KEY WILL NOT WORK AND YOUR WMC UPGRADE KEY WILL NOT WORK