R3M's spellbook injector no longer works, and appears to have been abandoned twice by different modders, so it's unlikely to be updated. Is that going to make all your mods unusable? That would be a real shame.
https://www.patreon.com/posts/spellbook-v2-55723766
it.s been updated to 2.1!! But still has the v2 name on the main file, but is a updated file.