When you get back to the point where you have Ruby4Lich installed, but you don't see a lich folder, at that point the easist fix is:
Go to lichproject.org/download.html
Scroll down to the link for Lich-4.6.52.zip
Download that
Unzip it, and move the unzipped Lich folder to your desktop
Open the Lich folder on your desktop and double-click lich.rbw file
From there, it should all work