Within the download area on your site, you may find that there is additional information you wish for people to be able to enter on their downloadable items. For example, you may have an area where people produce their own applications and need to add co-authors or version numbers. The downloads application allows to to achieve this by adding extra fields. These can then be used per category.
To add some extra fields, you will need to visit the following area in your admin CP.
Once you are in this area, you will see a list of any existing extra fields. You can create a new on by selecting "Create New"
You can then fill in the details for your new field, including the field type. As an example below I have added one of field type "Member" which will allow the user to select a members name for the co-author of their application.
As another example, I have now also added a checkbox set which will allow the user to select the checkboxes which apply to their download such as whether it is free, or currently in beta
Within any category, you will see that these can be selected to be used on that particular category. So below you will see I have selected for the Co-Author field to be available within my "Files" Category.