De-duping (Finding similar)script

Hi friends,
I am used to the find and remove similar item script available with DTP. However I have a bit more complicated aim - to de dupe a set of files or multiple citations in a single file. I am not tech literate and hence have approached some of my friends to help me. Is there any way I can get hold of the script currently in DTP? If so please let me know how I can access it?
Any information would be helpful and appreciated

The script “Find similar contents.scpt” is located in the folder ~/Library/Application Support/DEVONthink Pro 2/Scripts/Data.