You're welcome.
The LET IT BE movie has not been commercially available since it was shown in movie theaters back in 1970. All the other Beatles movies (i.e. A HARD DAY'S NIGHT, HELP!, MAGICAL MYSTERY TOUR, and YELLOW SUBMARINE) are available today on DVD, but not LET IT BE. At least in part, it's probably because making the movie was such a painful experience for the band. It was also painful for fans to watch; you were watching the break up of the greatest pop/rock band of all time. Very sad.
However, you can see the entire movie (I think) on Youtube.
Start
here, then follow to the other parts.
You'll be amazed by what the Beatles were capable of musically; you'll also be saddened by how this great band ended.