No, it is UVC (USB Video Class) and UAC (USB Audio Class) compliant, meaning it is automatically recognized by the operating system as a video source.
No, the AJA U-TAP HDMI supports a maximum resolution of 1080p at 60fps. It will downscale 4K inputs to 1080p for the USB output.
Yes, it is fully compatible with Apple Silicon (M1, M2, M3) and Intel-based Macs using standard USB 3.0 or USB-C (with adapter) ports.