I suspect that the DNG converter will work for you if you use it properly. It isn't your fault, but Adobe has created a kind of a silly interface in the DNG converter. Notice that it is asking you for the folder. When you are browsing for a location within the DNG converter, choose the folder, but don't open the folder. If you do then the DNG converter will tell you there are no images to convert. If you choose the folder then the DNG converter will convert all the files within that folder.
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