Modern antivirus software, including Windows Defender, uses "Controlled Folder Access" and "Real-time protection" that can block vMix from reading its own license key from C:\ProgramData\vMix\ or the Registry.
Follow these steps to resolve the "VMix GT Title Designer License Not Found" error: vmix gt title designer license not found
folder and look for any temporary files related to registration (be careful not to delete your presets). Often, simply restarting the computer after clearing the C:\ProgramData\vMix (if it exists) will force a clean check. Final Thoughts In 90% of cases, simply re-entering your license key Modern antivirus software