Series II MIDI 10.50.0.125 could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. This PC program works fine with 32-bit versions of Windows XP/Vista/7/8/10/11. This free program was originally developed by M-Audio. We recommend checking the downloaded files with any free antivirus. The most popular versions of the program are 10.5 and 4.3. The software is categorized as System Utilities.
From the developer:
M-Audio USB MIDI devices are divided into two categories based on differences in their hardware and firmware architecture: “Series I MIDI” and “Series II MIDI”.All Series II MIDI devices are class compliant for Windows XP, Windows Vista, Windows 7, and Mac OS X. This means that no driver is required for basic operation.
You may want to check out more software, such as E2Lab - Eternity II Puzzle Editor And Solver, Midi Player & Real-Time Key Detector or Midi Utility X2, which might be similar to Series II MIDI.