Hi For the Acymailing jDownloads compatible plugin go to www.acyba.com/acymailing/plugins
and search for jDownloads (tag plugin) v4.5.0 or higher (the word 'tag' is not related to Joomla! tags!
). This plugin supports both the 3.9 and the 3.2 series. It is a long
way down the list in the 'Files Management' section.
To get the user to supply emaill etc Then goto the User Groups Settings. In Group Settings tab Find the View Inquiry Form. When set to yes it willl show several other fields incuding wheter or not filling out the form is mandatory.
Have not yet had time to wrie an Article on this part of jD
PS things are a little hectic at present.