BI4 UDT COM "Class does not support automation"

I am trying to convert a VBA script that uses the XI3.1 Designer COM library to BI4.1 UDT.

I switched the reference to use BusinessObjects Designer 14.0 Object Library.  But the first call in my script ("Set DesignerApp = New Designer.Application") produces:

Run-time error '430':

Class does not support Automation or does nto support expected interface.

I tried just using the XI3 library to connect to my BI4 system, but I was unable to import universes (I also received errors manually using Designer to connect to BI4).

How can I use the Designer COM SDK in BI4 in VBA?