This software is Abandonware. It is no longer sold or supported by Apple, which owns the intellectual property. The original software sold for a whopping US$699 (about $1,458 today) plus plugins costing $99-$299 apiece, before Apple bundled them.
More importantly, There are no security patches, no driver updates, and no support forums. You are on your own. EMagic Logic Audio Platinum 5.5 Free Download
Despite the hurdles, users seek EMagic Logic 5.5 for several reasons: This software is Abandonware