Ismail

Use the shortcode `[recaptcha-protected-download]` to wrap any direct download link that you’d like reCaptcha to process.
`[recaptcha-protected-download]https://example.com/download.zip[/recaptcha-protected-download]`
Example
Here’s my `hello world` post HTML:
<pre>
Hello! This page is dynamically generated with my plugin called Content Generator which you can download from <a href="[recaptcha-protected-download]https://my-cdn.tld/static/content-generator.zip[/recaptcha-protected-download]">here</a>.

You can also download WordPress following <a href="[recaptcha-protected-download]https://wordpress.org/latest.zip[/recaptcha-protected-download]">this URL</a>
</pre>
Which is parsed as follows:
<pre>
Hello! This page is dynamically generated with my plugin called Content Generator which you can download from <a href="#rcpdl=371bce9996c0afc711648c2c4f3d5c97">here</a>.

You can also download WordPress following <a href="#rcpdl=7039e773658ed3c70d50e791ed4940fd">this URL</a>
</pre>
About
This plugin opts to generate fake links (anchors) controlled with JavaScript to open up a modal once clicked to opt users to complete the anti-spam test with <a href="https://github.com/google/recaptcha/" rel="nofollow ugc">Google reCaptcha</a>.
Once a user successfully submits a test, an AJAX callback will then verify the response and parse the download.
`md5` is used to hash the download links and fetch them later once a user submits a test.
You must provide your Google reCaptcha credentials which you can obtain from <a href="https://google.com/recaptcha/admin" rel="nofollow ugc">this page</a>
Once you activate the plugin, you should now navigate to “Settings” > “reCaptcha Downlaods” (or “Options” > “reCaptcha Downlaods” for network activated plugin) and add your Google reCaptcha credentials (public and private keys) which you can obtain from https://www.google.com/recaptcha/admin
The development version of this plugin is hosted on Github, feel free to fork it, contribute and improve it, or start a new issue if you want to report something like an unusual bug.
Here’s the Github repo: https://github.com/elhardoum/recaptcha-protected-downloads
Thank you!

reCaptcha Protected Downloads

Protect your downloads from bots and spiders with a shortcode and Google's no-captcha reCaptcha

GravityKit

This Gravity Forms add-on blocks spam using a non-obtrusive anti-spam measure and can email a spam report summary.
<h3>Spam blocking for Gravity Forms</h3>
To get started, all you need to do is activate the plugin!
<h3>Is the Gravity Forms honeypot field not working for you? 🍯 🐝</h3>
Zero Spam is better than the Gravity Forms anti-spam honeypot field. If you’re getting spammed, try this plugin.
<h3>Use this plugin instead of reCaptcha</h3>
reCaptcha is user-hostile! Use this instead! Users don’t need to click stoplights, crosswalks, or bicycles when you use this plugin to stop spam.
<h3>Enable or disable filtering per form</h3>
If you only want the plugin for specific forms, that’s possible! The plugin adds a simple “Prevent spam using Gravity Forms Zero Spam” setting to each form (requires Gravity Forms 2.5 or newer).
<h3>Spam report emails</h3>
Spam summary report emails are disabled by default. Once enabled, a spam summary that includes the number of entries per-form will be sent via email.
Choose whether you want to be notified after the number of entries reaches a threshold (e.g. 10 spam entries) or after a certain number of days (e.g. every week). If there are no spam entries, no report will be sent.
Requires <a href="https://www.gravityforms.com/?partner_id=1210629&irgwc=1&utm_medium=affiliate&utm_campaign=1210629&utm_source=Katz%20Web%20Services%2C%20Inc." rel="nofollow ugc">Gravity Forms</a>.
Brought to you by <a href="https://www.gravitykit.com?utm_source=plugin&utm_campaign=zero-spam&utm_content=readme" rel="nofollow ugc">GravityKit</a>. We create essential Gravity Forms Add-Ons.

Gravity Forms Zero Spam

It helps way more than Gravity Forms' built in features, and it's nice to try invisible options before making users deal with Captcha quizzes. :)

Appreciate this plugin a lot!

Besides its simple approach, David Walsh’s “Zero Spam” technique, it works well.

Simple and effective

An amazingly simple yet successful strategy, this plugin captures pretty much all automated spam with little chance of false positives. No need to bother people with nasty CAPTCHAs, just install this plugin enjoy the ensuing peace.

Sends automated spam to the bit bucket

Enhance your Gravity Forms to include anti-spam measures originally based on the work of David Walsh's "Zero Spam" technique.

reCaptcha Protected Downloads vs Gravity Forms Zero Spam