I think once Adobe announced ADDT was being discontinued, the issues related to incompatability went to the back burner.
If you want to fix the problem, you can probably do it yourself... just go to the user configuration folder: Configuration/Severbehaviors/php_mySQL/DigitalFilePro/Delete File.htm
and rename it to something like: Delete Files.htm
Then go to the file in the same folder: Delete File.edml
Open it in notepad and update the reference to Delete File.htm and update it to the new file name.
That should eliminate the conflict. Let me know if you have any problems.