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Ivanti Support have very kindly provided a workaround for this which seems to work quite nicely (I've slightly tweaked this):
Upload a Test file to Form Designer Tools > Attachments:
Add a Search in the Attachment workspace to find the RecID of the attached file:
In Request Offering, insert a Read Only Text field with a Default Value Expression pointing at the relevant RecID:
'<a href="/handlers/DownloadAttachmentHandler.ashx?objectid=9D8A4FAE890C4E8994AA62B879691F8A">Download File</a>'
Alternatively use the same expression in the Help Text:
Creates a URL or Help text with a Link to the attached file. When the user clicks on the link they are prompted to save the file where they wish.
Thanks Chris Bakken!