I tried both of those things. By the way, I'm just asking everywhere, so that someone out there will respond with something that will help. If there's a solution, hopefully I'll get it. But I'll be more patient next time and only reply to one place. I'm using NMM, and I think my Skyrim's up to date. At least Steam is up to date, and I think Steam automatically updates everything. Sorry, I fixed it; I got the wrong version of Convenient Horses, sort of, it's kind of hard to explain.