To configure file directory first you need to find out your root directory. There are several ways of doing it, and cms pro has that feature built in .

Go to /admin/system/ and under CMS info tab find Root Path entry:

Since I'm using Window OS, my path is W:\public_html\cmspro5\, but if you are on Linux/Unix OS, your path will be different like /home/username/public_html/

Next step is to create folder outside of your publicaly accessible directory. Since my public directory is W:\public_html\, I will create a new folder in W:\ You can name new folder whatever you want, I will call mine DDP_FILES, and I can access it from W:\DDP_FILES\ . In your case most likely /home/username/DDP_FILES/

Now that we have our secure folder, we need to enter new path into digishop configuration. Go to /admin/modules/digishop/settings/ , and enter new path.

Note trailing slash / at the end of the path. Just make sure regardless of your OS, you need to have trailing slash at the end of the path.