Steinberg moved through 5.1.1 and landed on 5.1.2 to fix specific bugs that plagued the previous builds. If you are experiencing random crashes or plugin weirdness, this is likely the fix.
This article provides a deep dive into the significance of the Cubase 5.1.2 update, what it fixed, and the current reality of finding this legacy installer. cubase 5.1 2 update download
To help you get everything running smoothly, please let me know: Steinberg moved through 5
The original release of Cubase 5, and even the initial 5.1 update, had its share of growing pains. Users experienced issues with the VST Bridge (which allowed running 32-bit plugins in the emerging 64-bit environment), graphical glitches in the mixer, and MIDI timing anomalies. what it fixed
