Community-preserved copies of Windows XP Professional x64 Edition are often available. Look for "Official" or "Retail" tags to avoid "Frankenbuilds" that might contain malware.
If you have an old workstation, look for the Certificate of Authenticity (COA) sticker. This key is often necessary to activate your installation. Why Use the 64-Bit Version? windows xp 64 bits download
While Microsoft officially ended support for Windows XP in 2014, "Windows XP Professional x64 Edition" remains a popular niche for enthusiasts, retro gamers, and industries needing legacy software support. This edition, released in 2005, was a significant leap forward, utilizing the Windows Server 2003 codebase to break the 4GB RAM barrier of 32-bit systems. Where to Download Windows XP 64-Bit released in 2005