Uncheck 'Protect important system files and folders' ?

It often does do a second pass of hash calulcation - this is normal. 1TB of files can take a while depending on how many same size files there are (and how large). External and networks drives can also be slower due to reading speed.

Make sure you are running the latest version. Uninstalling and re-installing the program should reset the database and hopefully clear any problems.

More information on resetting here-
https://digvolsoft.freshdesk.com/suppor ... e-cleaner-

This is something we a looking at for version 5. One thing to note though is that most processing time is taken up reading the files.

Use the Selection Assistant- https://www.duplicatecleaner.com/manual4/selection_assistant.htm?ms=AA==&mw=MjQw&st=MA==&sct=MzQ5 This should have the options you mentioned. For instance: to mark all, but not ONE largest (by file size) - Make sure all Unmarked (Unmark all) - Click 'Mark by file size-> ...

Have to check this first - are you sure the file sizes are that close? Note that Windows explorer displays the sizes in KB by default, not Bytes There's also a check-list here of reasons why nothing is found. https://digvolsoft.freshdesk.com/a/solutions/articles/16000029796 One useful test to check ...

I think this option was removed a couple of years ago (around 4.0.3), sorry about that - it looks like that manual page hasn't been updated. Alternate ways to limit the scope of the search include restricting to certain file categories in each scan (e.g. Images, documents), or limiting the number of...

Currently there isn't a function in TextCrawler to replace with random text or numbers, sorry.

You need .NET Framework 4.5 for Duplicate Cleaner 4 - which you'd have to install manually if you do not have a internet connection.

There are a few things you can try for this-

-Update the program to v3.2.7 if you can (download and put on machine via usb drive?)

If not:
-Turn off logging (in the More options screen).
-Rescan and delete less files (there will be less anyway as some have deleted before the creash).