This is working awesome. Thank you.
Just to make it even clearer for other users, the file wpdm-my-downloads.php is located inside the plugin wpdm-custom-access.
As Shaon mentioned, to increase the number of rows on the table, you will need to add "iDisplayLength": 100; after the line that says "sPaginationType": "bootstrap",.
(Because line numbers may change in future versions)