mikec1010,
To answer your question in a nutshell, there was only one copy of the Director's Cut of The Alamo in existence, and the fools at MGM destroyed it due to poor storage.
You can read the whole sickening story in these old threads:
http://www.dukewayne.com/showthread.php?t=662&hl=
http://www.dukewayne.com/showthread.php?t=1648&hl=
http://www.dukewayne.com/showthread.php?t=2172
and in these news articles:
http://www.jwayne.com/news/archives/00000028.shtml