There used to be a couple of links here, but they're dead, so I removed them. To play The Journey to Epsilon Pegasi, follow the Downloads section. The entire mod - the newest version - is hosted at ModDB, not anywhere else. The other mirrors are outdated! Please use those mirrors only if the MODDB one is for some reason down.
Installation instructions (if you are new to installing mods for FreeSpace) are included in the main download. If those instructions for some reason don't take you where you want to be, Google "FreeSpace Wiki" and you'll find all sorts of articles related to installing new mods. Note that JtEP requires FreeSpace Open.