found this site: http://www.lareau.org/btymusic.html
maybe it's one of these?

The complete soundtrack by Vangelis has never been officially released.

Vangelis released an album called "Themes" in 1992, which contains the following music from the movie soundtrack:

Opening Titles from "The Bounty" (4:16)
Closing Titles from "The Bounty" (4:58)



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A limited edition bootleg came out in 1994:
THE BOUNTY
Music By Vangelis
2 CD set: WD9405-2 and WD9405-2

VOLUME ONE (total disc time: 60:25):


Opening Titles (4:15)
Court Martial (2:20)
Setting Sail (2:50)
The Water is Wide (4:18)
Leaving England (1:46)
Bonny Kate (2:09)
Becalmed (2:44)
Attempting The Horn (5:46)
Disappointment (1:12)
Mr Friar Replaced (1:31)
Valentine's Burial (0:38)
Fair Sailing (2:34)
Tahitian Welcome (1:38)
Drowsy Maggie (1:39)
Ceremony #1 (3:06)
Ceremony #2 (3:04)
The Turning Point (3:14)
Sailors in Paradise (0:57)
Bligh Haunted (10:59)
It Will Not Be Long (3:36)
VOLUME TWO (total disc time: 56:01):

Toiavine (0:50)
Native Drums (1:07)
Fletcher's Goodbye (2:14)
Discipline (5:21)
Breaking Point (7:07)
Mutiny (4:11)
Bligh Set Adrift (7:55)
Reunited (0:40)
Argument (0:33)
Fletcher's Log (0:34)
On The Run (0:44)
Civilised Men (1:35)
Two Journeys (2:00)
Pitcairn Island, Burning the Bounty, Bligh Absolved (5:20)
The Bounty (15:42)