You have a bootable USB/DVD and a valid license key. Here is the install walkthrough.
The Internet Archive is the safest and most reliable source for software preservation. They host a vast library of operating systems that have been abandoned by their creators. Download Windows Xp Sp3 64 Bit Iso Bootable
Many classic PC games from the late 90s and early 2000s struggle to run on Windows 10 or 11. While 32-bit XP SP3 is usually the gold standard for compatibility, some older 64-bit games or specific patches run better in a native 64-bit XP environment without the overhead of modern OS background processes. You have a bootable USB/DVD and a valid license key