Here are the ready-made OS images for the PiKVM

Download an appropriate OS image for the PiKVM based on the device type and platform.
Flash it to a microSD memory card by following the simple instructions.
A minimum 16 Gb class 10 memory card is recommended.

PiKVM V4 Plus & V4 Mini platform (buy the device):

PiKVM V3 platform (buy the device):

Raspberry Pi 4, V2 platform (DIY):

Raspberry Pi Zero 2 W, V2 platform (DIY):

Pre-compiled images are only available for the Raspberry Pi 4 and Zero 2 W.
In all other cases, you will need to build the operating system yourself.
Don't worry, it's very simple.
Images archive