The MIDI I/O is a legacy product, and its compatibility is restricted by modern 64-bit requirements. Windows 10 & 11:
host version 7.4.0.309, which claims support for Windows 10 (32 & 64-bit), though these are not officially verified by Avid. Compatibility: Will It Work with My OS? digidesign midi io driver
Users have reported success using older, archived installers, but you may need to bypass Gatekeeper to install the unsigned driver. The MIDI I/O is a legacy product, and