Great

Have spent Days working with another similar plugin that requires 2 additional plugins to work. Unfortunately, the required specific download plugin does not play nice.
Tried Email Download Link and worked immediately. No going back and forth between three plugins.
Only disadvantage is the lack of formatting for the contact form and the download button.
However, this is really a minor detail as plugin is limited to 4 setup pages that really are easy to fill out with the help of well-written screenshots.
Good Job.