How to Activate Office 2021 LTSC Using KMS

Office 2021 LTSC is Microsoft's perpetual-license, non-subscription Office release for enterprise and professional use. Unlike Microsoft 365, it does not require an ongoing subscription — and with KMS activation, it does not require any license purchase at all.

What You Need

• A Windows 10 or Windows 11 machine
• Microsoft Office 2021 installed (Volume License / LTSC edition)
• KMSPico downloaded from this site, or the manual command steps below

Important: KMS activation works with Volume License (LTSC) editions of Office. If you installed Office via a Microsoft 365 subscription or a retail key, the KMS method will not apply — those editions use a different activation path.

Method 1: KMSPico (Recommended — Automated)

1. Download KMSPico from this site and extract with WinRAR (password: 123456).
2. Close all Office applications completely — Word, Excel, Outlook, Teams, everything.
3. Add the KMSPico folder to Windows Defender exclusions.
4. Right-click KMSPico.exe → Run as administrator.
5. The tool detects your Office installation and activates it automatically along with Windows.
6. Open any Office application → File → Account → you should see Product Activated.

Method 2: Manual via ospp.vbs

For advanced users who prefer command-line control. Open Command Prompt as Administrator and run:

REM Navigate to Office installation directory
> cd "%ProgramFiles%\Microsoft Office\Office16"

REM Install the GVLK for Office 2021 Pro Plus
> cscript ospp.vbs /inpkey:FXYTK-NJJ8C-GB6DW-3DRK3-BC295

REM Set the KMS host
> cscript ospp.vbs /sethst:kms.windowskms.com

REM Activate
> cscript ospp.vbs /act

REM Verify
> cscript ospp.vbs /dstatus

The /dstatus command shows the activation status. A successful activation returns "LICENSED" and an expiry date approximately 180 days out.

Troubleshooting

ospp.vbs Not Found

The Office directory may differ on your machine. Try %ProgramFiles(x86)%\Microsoft Office\Office16 (for 32-bit Office on 64-bit Windows) or search for ospp.vbs in File Explorer.

Activation Returns Error 0x4004F00C

This means the KMS host was contacted but Office is not eligible — usually because you have a retail/subscription edition rather than a Volume License edition. KMS activation only works with LTSC/volume editions.

Office Still Shows "Unlicensed Product"

Restart the Office application fully (check the system tray for running Office processes). The activation token sometimes requires an app restart to be picked up.