Download the Scibian 12 ISO
https://scibian.org/repos/iso/scibian_12-20240408-304a8713.iso
Make sure the machine is booting with UEFI
Choose the installation type
Follow the instructions
After starting the installer, the first step of the installation is displayed, you just have to press Enter key then follow the instructions on the screen.
During the different stages you will be led to :
Each step requiring action on your part will be described on the screen.