This program is great at finding duplicates, but unfortunately the licensing program Webminds created is a nightmare. The licensing program makes it almost impossible for me to use the program more than 90% of the time. I have contacted Webminds support at least 4 times this year to have my licenses re-activated for EDF. (Their other products also use the same licensing program, so they can be invalidated easily also.) If any changes to my computer happen, and I haven't deactivated the license first, I can not reactivate the program without writing to Webmind's Support, and asking for them to reinstate the license. For Example: Windows 10 upgrade invalidated my licenses, as has installing a new hard drive, and any big update to almost any system software or if you reinstall the software, will require you to reactivate the license.They do have a way to deactivate your license first, then you can immediately re-install and re-activate, but... Webminds is not always at the forefront of my mind, I don't use this software daily, so I don't think about deactivating my licenses with Webminds before installing things like Windows 10. I didn't have to re-install EDF, but apparently my licensing needed to be deactivated and reactivated. It would be nice if I could just use the software without having to write them, wait a day or two for them to reset my license. At which point I can't use it because I've moved on to another project. Very poorly designed licensing program.