How to activate windows 8.1 for free without product key

Step 1.1: Select the right license key for your Windows edition.

Here’s the list of Windows 8/8.1 KMS client setup keys.
W8 Core: BN3D2-R7TKB-3YPBD-8DRP2-27GG4
W8 Core Single Language: 2WN2H-YGCQR-KFX6K-CD6TF-84YXQ
W8 Professional: NG4HW-VH26C-733KW-K6F98-J8CK4
W8 Professional N: XCVCF-2NXM9-723PB-MHCB7-2RYQQ
W8 Professional WMC: GNBB8-YVD74-QJHX6-27H4K-8QHDG
W8 Enterprise: 32JNW-9KQ84-P47T8-D8GGY-CWCK7
W8 Enterprise N: JMNMF-RHW7P-DMY6X-RF3DR-X2BQT
W8.1 Core: M9Q9P-WNJJT-6PXPY-DWX8H-6XWKK
W8.1 Core N: 7B9N3-D94CG-YTVHR-QBPX3-RJP64
W8.1 Core Single Language: BB6NG-PQ82V-VRDPW-8XVD2-V8P66
W8.1 Professional: GCRJD-8NW9H-F2CDX-CCM8D-9D6T9
W8.1 Professional N: HMCNV-VVBFX-7HMBH-CTY9B-B4FXY
W8.1 Professional WMC: 789NJ-TQK6T-6XTH8-J39CJ-J8D3P
W8.1 Enterprise: MHF9N-XY6XB-WVXMC-BTDCT-MKKG7
W8.1 Enterprise N: TT4HM-HN7YT-62K67-RGRQJ-JFFXW

Step 1.2: Run command prompt in admin mode.
Click on the start button, search for “cmd” then open Command Prompt as administrator.

Step 1.3: Use command “slmgr /ipk your_key” to install a license key.
your_key is the activation key you got above.
Note: You need to hit [Enter] key to execute commands.

Step 1.4: Use command “slmgr /skms kms8.msguides.com” to connect to my KMS server.
kms8 is one of the servers I managing.

Step 1.5: Activate your Windows using the command “slmgr /ato”.
After running this command, the activation progress will be started.

If you see the error 0xC004F074, it means that your internet connection is unstable or the server is busy. Please make sure your device is online and try the command “ato” again until you succeed.

Method 2: Batch file

This one is not recommended anymore due to the new update of Microsoft.

Step 2.1: Copy the code below into a new text document.

@echo off
title Activate Windows 8 / Windows 8.1 ALL versions for FREE - MSGuides.com&cls&echo =====================================================================================&echo #Project: Activating Microsoft software products for FREE without additional software&echo =====================================================================================&echo.&echo #Supported products:&echo - Windows 8 Core&echo - Windows 8 Core Single Language&echo - Windows 8 Professional&echo - Windows 8 Professional N&echo - Windows 8 Professional WMC&echo - Windows 8 Enterprise&echo - Windows 8 Enterprise N&echo - Windows 8.1 Core&echo - Windows 8.1 Core N&echo - Windows 8.1 Core Single Language&echo - Windows 8.1 Professional&echo - Windows 8.1 Professional N&echo - Windows 8.1 Professional WMC&echo - Windows 8.1 Enterprise&echo - Windows 8.1 Enterprise N&echo.&echo.&echo ============================================================================&echo Activating your Windows...&cscript //nologo slmgr.vbs /ckms >nul&cscript //nologo slmgr.vbs /upk >nul&cscript //nologo slmgr.vbs /cpky >nul&set i=1&wmic os | findstr /I "enterprise" >nul
if %errorlevel% EQU 0 (cscript //nologo slmgr.vbs /ipk MHF9N-XY6XB-WVXMC-BTDCT-MKKG7 >nul||cscript //nologo slmgr.vbs /ipk TT4HM-HN7YT-62K67-RGRQJ-JFFXW >nul||cscript //nologo slmgr.vbs /ipk 32JNW-9KQ84-P47T8-D8GGY-CWCK7 >nul||cscript //nologo slmgr.vbs /ipk JMNMF-RHW7P-DMY6X-RF3DR-X2BQT >nul&goto skms) else (cscript //nologo slmgr.vbs /ipk GCRJD-8NW9H-F2CDX-CCM8D-9D6T9 >nul||cscript //nologo slmgr.vbs /ipk HMCNV-VVBFX-7HMBH-CTY9B-B4FXY >nul||cscript //nologo slmgr.vbs /ipk NG4HW-VH26C-733KW-K6F98-J8CK4 >nul||cscript //nologo slmgr.vbs /ipk XCVCF-2NXM9-723PB-MHCB7-2RYQQ >nul||cscript //nologo slmgr.vbs /ipk GNBB8-YVD74-QJHX6-27H4K-8QHDG >nul||cscript //nologo slmgr.vbs /ipk M9Q9P-WNJJT-6PXPY-DWX8H-6XWKK >nul||cscript //nologo slmgr.vbs /ipk 7B9N3-D94CG-YTVHR-QBPX3-RJP64 >nul||cscript //nologo slmgr.vbs /ipk BB6NG-PQ82V-VRDPW-8XVD2-V8P66 >nul||cscript //nologo slmgr.vbs /ipk 789NJ-TQK6T-6XTH8-J39CJ-J8D3P >nul||goto notsupported)
:skms
if %i% GTR 10 goto busy
if %i% EQU 1 set KMS=kms7.MSGuides.com
if %i% EQU 2 set KMS=kms8.MSGuides.com
if %i% EQU 3 set KMS=kms9.MSGuides.com
if %i% GTR 3 goto ato
cscript //nologo slmgr.vbs /skms %KMS%:1688 >nul
:ato
echo ============================================================================&echo.&echo.&cscript //nologo slmgr.vbs /ato | find /i "successfully" && (echo.&echo ============================================================================&echo.&echo #My official blog: MSGuides.com&echo.&echo #How it works: bit.ly/kms-server&echo.&echo #Please feel free to contact me at msguides.com@gmail.com if you have any questions or concerns.&echo.&echo #Please consider supporting this project: donate.msguides.com&echo #Your support is helping me keep my servers running 24/7!&echo.&echo ============================================================================&choice /n /c YN /m "Would you like to visit my blog [Y,N]?" & if errorlevel 2 exit) || (echo The connection to my KMS server failed! Trying to connect to another one... & echo Please wait... & echo. & echo. & set /a i+=1 & goto skms)
explorer "http://MSGuides.com"&goto halt
:notsupported
echo ============================================================================&echo.&echo Sorry, your version is not supported.&echo.
:busy
echo ============================================================================&echo.&echo Sorry, the server is busy and can't respond to your request. Please try again.&echo.
:halt
pause >nul

Create a new text document.