It is a pity, really, I agree with you Dakbykayk. Problem is licencing. Jimmy Page cannot edit the movie, nor anyone from the band camp. Maybe one day?
As for Louie Louie, I think you might be mistaken. According to Eddie Edwards from the Garden Tapes, who carefuly studied all the recordings of the three Madison Square Garden shows recorded that night (July 27, 28 and 29 1973), Louie Louie wasn't played. The setlist for those three nights were as followed:
1."Rock and Roll"
2."Celebration Day"
3."Black Dog"
4."Over the Hills and Far Away"
5."Misty Mountain Hop"
6."Since I've Been Loving You"
7."No Quarter"
8."The Song Remains the Same"
9."The Rain Song"
10."Dazed and Confused"
11."Stairway to Heaven"
12."Moby Dick"
13."Heartbreaker"
14."Whole Lotta Love"
Encore:
15."The Ocean"
16."Thank You" (July 29th only)
The only missing song is Thank You. A soundboard recording of it exists, but so far it has not been reported to have been recorded by Eddie Kramer (probably was), it's not that great (the band plays it but it has not been played for a while and it shows), couldn't be fixed (no alternate dates to fix the now-very-tired Robert Plant vocals), and footage has to exists (which is doubtful, cameramens probably missed it, like they did for half of the concerts).
But yeah, it was played at the L.A. Forum on 25 June 1972. The show was recorded (but not filmed) and it was released on the 2003 CD How The West Was Won, sadly without Louie Louie inside. You can find it an a bootleg I think.