How to convert dng to tiff or jpeg? Using Adobe Elements 15

If "imported" you mean you have the dng files in the organizer, you can select the dng files in the organizer and go to

File>Export As New File(s).

When you open the original cr2 files into camera raw, instead of using the Save As from inside the converter, which only saves out to dng, use the Open button to open the cr2s into the pse 15 editor and then use File>Save As to Tiff or Jpeg.

If you have more than one file open in the Editor, then you can go to File>Process Multiple Files to speed up the saving of the open files orv use Process Multiple Files on the folder of dngs.