A community-made, unofficial driver for older USB-only Casio keyboards on Mac is available on GitHub and may work for newer macOS versions like Big Sur.
This keyboard will not work with iPad or iPhone because it lacks "Class Compliant" MIDI support, which is required for mobile devices. Installation & Troubleshooting USB Midi driver for Windows 10 - Casio Music Forums casio lk 300tv draiver skachat
The official driver was originally designed for older Windows versions. A community-made, unofficial driver for older USB-only Casio