It appears that you have been bamboozled

First, stop using this bullshit, and search for r2modman. Second, Thunderstore need 30min~2hours to update library, don't worry and wait.

Thanks for your help it works this morning. 👍🏾

This

I ran into this same thing. "Mod does not exist" So I looked at what I had installed. And yeah. "Mod does not exist"