Thanks for the response.
We need the ‘Email lock’ option to send an email to the logged in user after or at the same time they click download, we don’t want the user to enter their email address since the system already knows what it is because they are logged in. The email is effectively a disclaimer and is required as evidence that the user accepted the terms of the download, essentially that they will read and understand it.
We have it close (see pic), how can we achieve what’s required other than getting into the source code. Could the ‘Download Notifications’ paid add-on be configured to do what we need do you think?

This is our test download: https://2p7.fda.myftpupload.com/download/siemens-daisy-chaining-of-extension-cables/
thanks & regards