Just bear in mind that Zerbu's real life can be a bit complicated and there are periods of time - some long times - where he can't update. So don't let your game depend on any of his mods, just use ones you won't mind getting rid of later if they get out of date.
"You can do refraction by raymarching through the depth buffer" (c. Reddeyfish 2017)
While the school mod does "work", I wouldn't consider it safe to use, much of the code has changed a lot in the last 12 months, with big changes like Parenthood, and C&Ds.
I do miss the School Mod, but myself wouldn't put an old inactive school mod in with this current patch level.
I miss it now too. Since the latest patch, the mod has worked for school itself, but my grim reaper became one of the Townies named Okada Something. he came dressed in jeans and t-shirt and cat ears. I then started to notice that random townies were floating around town on reaper smoke. Not sure if the school mod was the problem but I took it out of my game and I also removed the custom career mods since the patch made those unworkable. My whole 4 generation game was still not working correctly, even when I went to a previous save, so I had to start a new game so am now on generation one with out any problems. Lesson learned? probably not. I will bork up my game again someday with another ill considered mod. ;-)