This is the installer I help to build in my book, Building Your Mouseless Development Environment.
I use this installer to test every month if the content of the book still work.
If you wonder why every month, there's a new version of the Arch Linux live system released every month.
The official installer is part of the mouseless book companion: https://github.com/Phantas0s/mouseless-book-companion/tree/master/part_III/05_user_installer/arch_installer