A guided way off Windows
Linuxify is a Windows program that helps you move to Linux. It scans your PC, recommends a distro, lets you try it safely in a virtual machine, copies your files into a Linux-ready staging folder, and only at the very end, with a typed confirmation, sets up a dual boot.
It has a command line and a window. The window maps the programs you have installed to Linux equivalents from a list of about 590 entries, and the installer paths cover several distros including Omarchy.
It can repartition a disk, so it is built to be hard to run by accident
The install step shrinks C:, makes a partition and adds a boot entry. Everything else exists to make that step safe: a dry run that prints the plan, a typed confirmation that names the disk, and a lock file that makes a PC permanently refuse disk changes.
Undo and the GPT packing trap
The undo path had a bug in how it packed the GPT partition table, caught while testing in a VM. The fix is in the boot-firmware code. It is also why the README tells you to back up to a separate disk and unplug it first.