You can download the LYT kit by clicking Download the LYT Kit below:
I don’t believe most people add the LYT Kit to their vault because many people only want their own notes in their vault, but it’s up to you. It’s your personal knowledge management system, so you can do whatever you want. I can’t speak to the decision to keep Roget’s Thesaurus on Obsidian Publish, so maybe @nickmilo can explain. I’m just grateful that Denis and Nick have made it available to us.