Creating a distribution form "cookies" for subscription

There is a website created on CMS Joomla!. From third-party components, used: K2, AcyMailing.

I want to implement the idea, namely, to offer downloading any product, in exchange for a subscription.

I see the implementation as follows:

Let’s say I want to give away a book for free. I post a similar form on the site, where I suggest entering the user name and mail, then click the button "Get a book".

I put the book in some storage, let’s say in Yandex.Disk or wherever, the main thing is to take a link to download from that place.

The user enters his name and mail, clicks the button "Get a book", then it is redirected to the page I created (the form should be a line to enter the desired url).

At the same time, Joomla! Conducts a standard user registration, with confirmation of mail.

The user goes to his mail, pokes at the link confirmation mail. Once this has happened, a letter should be formed, with a pre-created template of the letter and with a built-in link to the download of the product.

As a result, the user receives a download link, I get the username and E'mail, which should also appear in AcyMailing (but like, any user registered with Joomla automatically gets into AcyMailing).

If the idea is clear, I await suggestions. Otherwise, I am open to communication. The price can be increased if the contractor explains why it is necessary to do so.