Can you tell the procedure on how they can update? Because as far as I know, you need to create text back-up and restore it in new version in order to update. Currently, they cannot make text back-up because of the error.
This is not the issue of upgrade SERP. But serverip.dat in this case contains the value: 192.168.88.12:1301, so this is local IP of the server with SERP.
Anyway I don't understand what do you me...