The printer won’t do any leveling with a fully heated nozzle.
The MK4’s we use at work and my personal MK4 all heat up to 170 before bed leveling, and if you previously swapped filaments before leveling, the printer will pause and wait until the nozzle has cooled down to the target range before initiating bed leveling.
Had this happen as well with the GR86 trunk handle file that’s on there as well. I made a make, tried to mark it as such, but was given the same error. Like with your case, the creator doesn’t have an option for purchase/support.