License Install Failed For License Type: 1 Result Code: 0xc03f6601 May 2026

Troubleshooting Guide: Resolving "License Install Failed for License Type: 1 Result Code: 0xc03f6601" Errors

Step 1: Identify your Current Edition

Open Command Prompt as Administrator and run:

while trying to validate a digital license for an app or the operating system itself Understanding the Error License Type 1

slmgr /ckms

1. The Registry: HKEY_LOCAL_MACHINE\SYSTEM\WPA
2. Data Store: C:\Windows\System32\spp\store