Spent two years slowly building my first PC and can’t figure out how to get Windows 11 booted on to it

First off: extreme beginner here. I don’t know anything about software but I finally got a frankenstein gaming setup physically up and running.

I bought a Windows 11 Pro password key and downloaded the file onto my old Macbook because its the ONLY other computer I could get ahold of. It’s running OS Catalina 10.17.5 which is too old of software to allow a UTM Virtual Windows to launch the Windows 11 Installer. I can’t figure out how to copy the download file to a thumb drive.

Am I completely out of luck? I’m sure if I could access someone’s PC tomorrow I could easily load the thumb drive for boot up.

tldr: is there a way to get Windows 11 onto a thumb drive from a very old Mac device so I could launch it on my empty pc build?