Released as a free update for registered users of Cubase 5 and Cubase Studio 5, version 5.5 introduced significant performance and workflow enhancements:
Cubase 5.5 was designed for older hardware, making it a popular choice for "retro" studio builds. Downloads for unsupported software / Cubase - Steinberg Cubase 5.5 Download Free Full Version
Cubase 5.5 is extremely old (originally released in 2010) and has significant compatibility limitations: eLicenser Control Center - License Management Released as a free update for registered users
Cubase 5.5 is professional software that requires a valid license. Cubase 5.5 Download Free Full Version