Because 5.3 is an older version, it is no longer the "default" download on the main EFI landing pages. To find it, you must access the EFI download archives.
Before downloading, ensure your workstation environment supports this specific version. Operating Systems Fiery Command Workstation 5.3 Download
If you need help determining if your specific is compatible with 5.3, I can look that up for you. Check if your Fiery Server version supports CWS 5.3? Provide a guide on upgrading to CWS 7 instead? Because 5
Visit the EFI Support & Downloads page.
Windows XP, Windows Vista, Windows 7, and Windows 8. (Note: Windows 10/11 may experience instability with 5.3). Because 5.3 is an older version