Fix Windows Store Error 0x80073cf9: Clear Cache & Repair - Resolve 'ffmpeg command not found' Error in Python-Fix 'No matching distribution found' for pip install on Python 3.10

Extra verification checklist

• Restart the affected app after changing permissions or configuration files.
• Test the same workflow in a clean browser profile or a temporary user account.
• Compare the result on another network if the error may be connection related.