CCleaner's Duplicate Finder finds duplicated files well, but it cannot delete any of them.
I select the files I want to delete in the duplicated files result window, then click on the "Delete Selected" button, and it says "The operation has been completed. Some of the selected files were not deleted.", and none of the selected files are deleted.
However, I can delete the files manually using Windows Explorer without any problem.
I use CCleaner Free v5.16 on Windows 10 Pro (64-bit).