Bethesda sabotaged them on purpose.
Why would they do that. No they didn’t. They wanted to push something official because of the show and generally don’t bother not breaking mods with updates.
It’s impossible not to, script extender uses pointers to the game’s binary to bypass API restrictions.
Any change to the source code will break script extender.
I play on steam, or on console, I guess I won’t be playing this mod!
Downgrading should be possible on steam via steam console commands. I noticed large collections on Nexus usually tell you to use some sort of downgrader program but I’ve always just used the steam console instead and been fine.
It says in the article that it comes with a downgrader packaged in the installer. That said they’re working with GoG, so the downgrader might not work for the steam edition.