Hello Piotr, I will check to see if this has been reported in this version and will revert back to you. Have you checked if this is repeatable in the latest version with the customer's data?
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...