First of all, Cat Linux is builded on Buildroot so, you NEED to boot it manually, but this wiki will be help you to booting and installing Cat Linux.
Dowload QEMU from https://www.qemu.org/download/ and download boot.img (our REQUIRED partition to install Cat Linux) from https://linktr.ee/novaos/ these tools is required for installing Cat Linux.
Copy boot.img to QEMU path for example: C:\Program Files\qemu, and open CMD as administrator.
Type to cmd: "cd (PATH THAT YOU DOWNLOADED QEMU for example: C:\Program Files\qemu)" press enter and type "qemu-system-x86_64 -hda boot.img".
And you will get this program called QEMU:
Type this to boot: : "bzImage root=/dev/sda" and wait until it boots...
You will get a message called like "Buildroot login:" type "root" and press enter.
Nice, everything is done and we got a shell here!