Duplicate Finder doesn't delete files

Hi, 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).

Hi All, I've encounter this issue multiple times, figured it out multiple times and then forgotten my solution ... multiple times. The issue for me turned out to be that the folder/files could not be deleted because they had the "compress ..." attributes enabled. Check the folder/file by right-clicking it > Properties > Advanced (general tab) > uncheck "Compress contents to save disk space". After this, I was able to use the Duplicate File Finder deletion without issue.