Adam,
 Not sure if there is a step missing, but I keep getting an error –
 403 - Forbidden: Access is denied.
You do not have permission to view this directory or page using the credentials that you supplied.
I am the administrator on the account.
Here is what I have done:
Start Conditional Statement – This looks at the “Manufacturer”  field on my screen in order to retrieve a document unique to the manufacturer shown.
          Retrieve Value From Table –
- 1.      Where will the value be retrieved from?
- From Table: DocumentLibrary
- From Field: Document
 
- 2.      Criteria: How will this record be located?
- Where Field: Document
- value is:     (In here I put the download link for the document)
 
If multiple results: Retrieve First
- 3.      Result: How do you want to use the resulting value?
- Place value in: Action Result = FindDoc
Load Web Page
          Target          New Browser Window
          Enter URL   Action Result = FindDoc
End Conditional Statement
I believe the problem is in the Retrieve Value action.  Other than what is above, I have tried everything else I can think of : Document, DocumenFileName (with name of doc), Document ExternalURL (with download link), etc.
What’s missing?
 
Mario