It should be customisable. I had no problem adding that field to window definition.
You might try leaving only USDClass window definiton in file(+externals).
If that doesn't work, can you please provide a window definition as well?
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...
