UR-44C installation on Mac 10.5 OS No MIDI recognition

Cubase LE AI Elements for MAC 10.5 Build 365 64bit 2/16/21
HARDWARE/COMPUTER
MAC OS High Sierra 10.13.6 (max available for this model of Mac)
iMac 27” (mid 2011 iMac 12.2
Studio Setup / VST Audio System / MIDI Port setup
Does not reflect installation of UR-44C Ports; IN/OUT
All AUDIO functions work properly

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Hi and welcome to the forum,

Did you install the UR driver, please?

Steinberg UR-44C audio interface
Driver: Yamaha Steinberg usb V2.1.2 (V3.1.3 will not install on 10.13.6)