
Unfortunately I hadn't enough time to write the documentation, but it shouldn't be a big problem for you - simply copy version for your CPU to ImageFX:Modules/loaders/ directory, perhaps storing the original JPEG loader that came with ImageFX in some safe place (you have to move it to different directory - just renaming it is not enough). Prefs file should be put in ENVARC:ImageFX/. Check it out with a text editor, some helpful information is stored inside.
That's all. If you have problems, just catch me at the email below.