That worked! I stuffed it up a bit and had more rework than I would have liked… but its all working now 🙂
I tried that manually already, as it is recommended several times on this forum. Unfortunately it didn’t work work; changing theme and disabling any/all plugins hasn’t made any change to the error that’s occurring.
Thanks for the recommendation of installing Health Check, though. I was able to install it, which made the process easier.
But it still didn’t work…