Here you can find ready-made Pi-KVM images for Raspberry Pi
Download the appropriate memory card image for the Pi-KVM. Select the image by the board, platform, and the video capture device you are using.
Minimum 16 Gb memory card class 10 is strongly recommended.
Raspberry Pi 4, v2 platform:
- For HDMI-to-CSI bridge: v2-hdmi-rpi4.img.bz2 [SHA-1]
- For HDMI-to-USB dongle: v2-hdmiusb-rpi4.img.bz2 [SHA-1]
Right now, pre-compiled images are only available for the Raspberry Pi 4. In all other cases, you will need to build the operating system yourself. But don't worry, it's very simple.