Mass Effect Legendary Edition included all the DLC packs of the trilogy that have been released to date, with the exception of one: pinnacle station, which is war-oriented. BioWare explained that the source code for this DLC is missing and the backups are corrupted. It would take months to re-create this DLC, so it was decided not to include it in the Legendary Edition.
Now fans of the game haven’t stood idle, and a mod production team has brought Pinnacle Station back into the game, both by correcting the errors that existed in the original and by uncovering a lost Easter Egg.
Mgamerz explained the technical difficulties of preparing this mode with a very detailed blog post on the ME3Tweaks site. In fact, the project started with the idea of adding only Legendary Edition;a Shepard’s Pinnacle Station apartment, but then it became the complete DLC.
The me1 code used in legendary edition is very similar to the original game, which made it a little easier for the team.
If you want to win Mass Effect Legendary Edition; a Pinnacle Station, you can download it from Nexus Mods.