Hi Anton,
I am on the Partner Support Team at Symantec.
From the error you provided, there appears to be legacy table data preventing the install from proceeding. To verify this condition, you can check the 'ksubscribers' database through SQL Management Studio to see if the SymInt.MachineAgentOrg table is already present. This is likely true. If the table does exist but is missing the ServerType column, the easiest fix to do is to run the following command against the database:
DROP TABLE SymInt.MachineAgentOrg
This function will purge the table and allow it to be recreated when you re-apply the schema.
Regards,
Shawn