This was fully released. It wasn’t some “rare” release. What’s the mystery about? It’s easily downloaded https://3ost.ru/6002-the-danny-elfman-batman-collection.html
What I mean is that it was never realized online officially, and the copies that do exist, are usually highly compressed.
Uh. I just posted a FLAC version. And that’s been up for years - literally since 2016.
Well, there goes 100$ bucks.