Sending of 2 emails is correct.
One email is what I call the “notification email”. That email goes to whatever email address is in the To: of the CF7 form you created. Normally, that is the wordpress admin email address (which is generally your email address as the admin). That email tells you what the website visitor downloaded, but it does not contain a link to the download (or an attachment of the download). This email almost always gets delivered without any problems.
The other email is sent by EBD and it goes to whatever the website visitor typed into the form when he visited your website. That email often does not make it to the inbox of whatever email address was typed in. The reason that happens is that the receiving email service (Yahoo mail, Gmail, etc) thinks that the email is spam and blocks it. That usually happens when your wordpress is running on shared hosting because the From: of the email will be something related to the physical computer rather than to your domain name. That causes Yahoo and some others to outright block the email.
In your case, you are getting both emails, which tells me that you are probably testing your EBD form by putting in the same email address as your wordpress admin email address, which isn’t a very good test. You need to put in a Yahoo mail email address and make sure that account actually gets the email. Assuming it does not receive the email, then you either need to install Postman SMTP (which is what most folks do) or install Custom Sender For Email Before Download and set the From: value to be a -valid- email address for your domain name. Then test again.
Assuming you have everything working and understand all of the above and you still want to stop the notification emails, then I suggest you just change the To: in the CF7 form to some valid email address that you never check (or filter it in your email program/service).
@dtynan thanks Dtynan, a complete school boy error on my part. I have two emails linked to gmail account, I was capturing with a different email address as apposed to the email address CF7 is linked to, but with both coming to gmail I made the mistake of thinking its sending two mean while its actually doing what it should, apologizes. thanks for the assistance.