Having no end of trouble here. I’ve thankfully got it all backup up, but its driving me crazy.
Quite simply, overwrote the files from 4.5.16 to 4.5.46 to upgrade them running php 7.3. I just get a forbidden with anything but my original files actually in place and I am struggling to understand why. The .env has not been touched and moving the old files back into place sees everything load again. I cannot see any permission issues etc, so I just cannot figure out why a full FTP upload / overwrite that took hours just refuses to play.