Sage 50 Accounts 2015 (UK) with network share on SBS 2008

What:

Sage 50 Accounts and Small Business Server 2008

Problem:

Customer has Sage data on the network share. He upgraded Sage Accounts software to 2015, which now requires installing Data Service on the SBS 2008. After installing service I still get the following error on the client's PC:
"Unable to connect to the Sage Data Service on machine <hostname>"

Solution:

Make sure firewall is not blocking a connection, if that still doesn't work then:

1. Log on to the SBS server
2. Go to Control Panel > Uninstall a program
3. Find "Sage Data Service" on the list and click "Change"
4. Now select "Repair"