In 2002, Apple acquired Emagic. Shortly after, they announced that Logic would no longer be supported on Windows. Version 5.5.1 became the "final frontier" for PC users, leading many to keep dedicated "Logic 5" legacy machines running for years.
If you find an old ISO or a dusty CD-R with this keyword, should you install it? Probably not for critical work, but here is its legacy: emagic+logic+audio+platinum+5+5+1oxygen+32
While originally designed for Windows 95/98/XP, enthusiasts still run this version on modern systems: In 2002, Apple acquired Emagic