Thank you for your review, but the things you mention are already part of our plugin. We will explain it briefly for you.
The free version has no restrictions regarding emails.
Double opt-in functionality is available in the free version. The first opt-in takes place when the download form is sent with the optional checkbox ticked. When the download link is clicked in the email, it is confirmed that the subscriber is actually the owner of that email address. After the validation of the download link the subscriber can be used for eg newsletter, so there is a double opt-in functionality available you could use (also in the free version). In addition, the necessary data is stored in the database to make the opt-in demonstrable (so you can prove the consent of the user).
You can use our plugin in several ways, depending on the regulations for your country. If you want to offer the download only if they opt for your newsletter, you can use the mandatory checkbox. If this is not allowed in your country, you can use the optional checkbox to opt for the newsletter (GDPR compliant.)
And lastly, the download links are secured in multiple ways. Direct access to the download file is blocked and the download link in the email is protected with a nonce and can be limited so that the link cannot be used indefinitely.
If you have any questions, feel free to open a support ticket. We are glad to help you.
Kind regards,
Team Download After Email