Long press on one of the entries to bring up the select menu. Click on each one of the files and press the trash icon in the upper right corner. The entries will be removed from the list but the files will remain in the Download folder. Too bad there is no 'select all' button. 

Refresh Downloads list
How to add Special price column to 


  category products grid


under

Catalog -> Manage Categories -> Category_to_be_edited
