Or just use a form plugin so you can capture info and have the form email them with a download link.

I think a form plugin was what I was looking for.
Easy Digital Downloads looks great for use later on.

Here’s a plugin for that https://www.ads-software.com/plugins/mailchimp-for-wp/

Then you just create an auto-responder in mailchimp with a link to your ebook.

https://kb.mailchimp.com/campaigns/images-videos-files/send-a-file-to-new-subscribers

Cheers ??