I use Immersive Spell Learning - DESTiified. I tried another one, can’t remember what it’s called, but didn’t like it. It was too drawn out. DEST is kind of simple and easy to use. Has a MCM. Not sure about Skyrim version though, I use 1.6.

Second this.

Sometimes for whatever reason the file may not download correctly. Redownloading and installing helps. I’ve been using Blunt and Blade on my current playthrough and haven’t had any problems. This has happened to me a few times.

And Crash Logger is definitely a life saver. Most of the time it’ll tell you exactly what’s messed up. Makes troubleshooting big load orders easier to figure out.