From what I see on Wikipedia, the only company to issue that album was Nautilus, and they shut down in 1984, 5 years after its release. And it looks like it was the only one of his records that they released. Has it appeared on CD since Nautilus was one of the first labels to digitally record, and CD was out in 1983. But considering that, maybe Tim Weisburg owns the masters and he just hasn’t licensed the album, or even after all this time there may still be rights issues that can’t be resolved because Nautilus no longer exist, so the album is stuck in legal limbo where it might stay until 2074 or 50 years after Weisburg’s death, and only then could it be reissued, because it would be public domain.
I'm wondering if there might be some legal issues regarding the track Intimidation. Fogelberg wrote it, and after the lawsuit Weisberg filed(I don't know what was involved or how it turned out), there may have been some changes to existing agreements regarding royalties from future endeavors; maybe Fogelberg's estate won't let Weisberg release the album digitally or in CD form. Who knows? At any rate, it's kind of a real bite in the butt, because it's good music.