So you plugged in the KeyControl 49, opened Logic Pro, and... nothing. No MIDI signal. Here is the definitive checklist.
While ESI notes that some early KeyControl 49 models are considered legacy and have discontinued official development, they still work via this class-compliant method. Esi Keycontrol 49 Driver Mac
If your Mac only has USB-C ports, you will need a reliable USB-A to USB-C adapter or hub. So you plugged in the KeyControl 49, opened Logic Pro, and