You cannot just download files.
If you prevent users from viewing files in the user rights settings, you will not be able to view or download files.
For details, refer to Setting Up Access Permissions for Folders.

The order in which files are displayed can be set in ascending order, or descending, based on the following items

• Subject
• File name
• Updated

The system administrator can change the default value of the file order.
For details, refer to How to change the default value of the file order.