I can provide the or a download link for the fix based on those details.
: Use the Windows search function to find the registry key KONAMI > Yu-Gi-Oh! Power Of Chaos > system . Ensure the CommonDir path correctly points to your Common folder. unlock all card yu-gi-oh power of chaos legend reborn
Ensure you have downloaded the full Legend Reborn mod (often split into multiple parts) and extracted it using WinRAR. I can provide the or a download link