Hi,
Thanks for contacting us here about this extension.
1. access via customer registration
2. possibility to define visible materials for each customer
3. see what the customer downloads and when they do it
4. if possible, IP tracking of the customer
1. This is something not possible in our plugin currently.
2. Sorry, I'm not sure what do you mean materials here, but you can restrict user access to preview or download file on frontend.
Please go here for more details:
https://www.joomunited.com/wordpress-documentation/wp-file-download/225-wp-file-download-files-and-categories#toc-file-access-visibility 3. Yes, we have Statistics feature so you can see who downloads (registered users) and when they download files.
Please go to the link below for information:
https://www.joomunited.com/wordpress-documentation/wp-file-download/225-wp-file-download-files-and-categories#toc-8-file-download-statistics 4. This is something not possible in our plugin. You should customize yourself in this case.
Hope it helps!
Kind regards,