It sounds like you mean the Warner Chappell bootleg, which was a two disc. I've been after that for a while, too. Sometimes, copies turn up on ebay similar to it. I own a bootleg I ordered from arksquare (a single disc) which appears to consist of outtakes from the recording and there is the popular Immortal Records release mixing Queen songs and some Kamen material.
I had hoped some label would have released the entire score to Highlander by now, especially as Mr Kamen is no longer with us.

richard_neal, January 27, 2005; 8:47 PM