So does anyone have any ideas what this could be? At this point we may have to ditch UMDS and just manually import patches etc which seems a shame....
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We have resolved the issue - hope this helps anyone else in the same position...
We are using IIS to host the files. You need to add the different MIME types to the website that is hosting the files.
So on either at the website top-level or vdir (if using) you need to add vib and sig mime type application/octet-stream.
I would suggest an IISRESET to refresh everything.
FYI: This is what we followed originally, but it does not mention MIME types - not sure how to suggest document update?