Threads were already configured. THe Maintenance works (or should) the same way as Sales Ledger>>maint>>OK Invoices (non stop). Though never tried to OK thousands of invoices with this maintenance.
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...