Empire does have the issue that the menus aren't as smoothly transitional as Jambe's original because of the way Encore did them. Jambe's Jedi was previously converted by Boon23 into NTSC although not pitch-corrected or slowed down but the disc was better authored (keep in mind that while the content is 100% Jambe's work, the menu authoring had to be re-created from scratch) so I converted Returning to Jedi in my method and inserted it into Boon's authored disc. It's also a dual layer DVD encoded at the same bitrate as Jambe's original while Boon's was single layer and much more compressed. Thing is, after finishing it, no one seemed to want it and folks were satisfied with the single layer version available. I've sent a copy to Jambe and to two other people that requested it (1-post noobs that went as quickly as they came) and that's it.
Anyway, Jambe's original PAL versions of Building Empire and Returning to Jedi are available on torrent at Demonoid, and NTSC versions of Empire and the single layer Jedi are there as well. Dual layer Jedi is as yet unavailable.