"More space required to install the update." Said my old iPad with shockingly small storage space od 32GB.
Ok, let's see what I can uninstall... wtf, @damus is over 6GB even after purging the cache!
Uninstalled. OS updated. Damus reinstalled. 150MB. That's more like it.
It would be nice if it didn't bloat like that, for poor people sake.