License Install Failed For License Type: 1 Result Code: 0xc03f6601 Repack

The error 0xC03F6601 typically appears in the Client-Licensing event logs when Windows or a Store app fails to validate a digital license. In most cases, "License Type: 1" refers to the core OS activation or a primary application subscription, such as an upgrade from Windows Pro to Windows Enterprise. Core Causes

Connectivity: Problems reaching the Windows Store API or organizational activation servers. Go to Settings → Update & Security →

When to escalate to vendor support

Contact vendor support if:

5. Use Microsoft’s Activation Troubleshooter

  1. Download the Microsoft Office Scrub Tool (o15-ctrremove.diagcab) from Microsoft’s support site.
  2. Run the tool and select Uninstall Office.
  3. Restart your PC.
  4. Reinstall Office from your Microsoft account or from your original installer.

Step 1: Identify your Current Edition

Open Command Prompt as Administrator and run: Download the Microsoft Office Scrub Tool (o15-ctrremove

Connectivity Issues: The device cannot reach Microsoft’s Activation Servers or a corporate Key Management Service (KMS) host. or blocked by system policies.

C. Transitioning from Volume to Retail

If your system previously had a Volume License (KMS or MAK) installed—common in corporate environments or evaluation versions—and you attempt to install a standard Retail key without properly uninstalling the Volume License, the remnants of the old licensing ticket can conflict with the new one.

In simpler terms: Office tried to install your product key into Windows' secure vault, but Windows refused to accept it because the existing data is damaged, incorrect, or blocked by system policies.