EFI XF 4.5.8 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. EFI XF is included in System Utilities. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. This tool was originally designed by EFI.
From the developer:
EFI™ Colorproof™ XF, a professional-level RIP, enables you to manage color supply chain from design to production to output by providing you with all the tools to produce the best color, It allows you to produce ISO 12647-7 / 8 compliant validation printing and contract proofing and G7 compliant proofs on inkjet, laser and LED printers.
You may want to check out more software, such as Raise Data Recovery for XFS, EFI PrintMe Driver or XF Designer 2011, which might be similar to EFI XF.