DigitalVolcano Software Support

There aren't any limits. It looks like it's got stuck on a file somehow. Unfortunately you can't yet display the current file being worked on (this is something in to-do list).
One thing to try is limiting the file size (e.g try <100mb) and then raise the limit if it runs ok.

At the simplest level you can run a scan (Exact matches or Image Mode Similar matches), Mark 'Only one file in each group', and then copy all the marked photos to your new folder (making sure Overwrite is turned off).

You can add the folder name/wildcard to the Exclude box (under the file filter). Use a semicolon to separate names,.

Side by side projects:-

As promised - a few screenshots from the Alpha:

Does using the virtual drives/folders feature help? This allows you to make an image of a drive for offline comparison.
https://www.digitalvolcano.co.uk/duplic ... =&sct=MzQ2

It usually checks by volume drive serial number among other things - is it possible that one drive was cloned from the other at some point in the past?

If you are happy you can ignore the warning (be sure you have backups before removing anything though).

You can try:
Selection Assistant
-All but one matching SET in each group
-(Checkmark) File name - Does not contain - . (dot)

This should work for .NET regular expressions though I've not tested it in DC

https://regex101.com/r/MAJQSZ/1

Next to the replace button. (Pro version only)

See manual "Action buttons" section
https://www.digitalvolcano.co.uk/textcr ... =&sct=MA==