Paid Memberships Pro has always been and always will be 100% GPL and available for free to download from WordPress.org. So how are we capturing (and hopefully converting) all of these free users of our plugin and documentation?
Below are a few tactics that have helped Paid Memberships Pro grow into (one of) the most used membership plugins for WordPress.

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Give away quality content for free on your website.
Share on social media. Guest blog. Post free plugins to the WordPress.org repository. Anything to get traffic to your site. Make sure the free content is useful to your target customers.
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Have a desirable product to encourage users to share their email on your site.
With Paid Memberships Pro, we ask you to become a free member before you can download the plugin or view our documentation. You could use white papers, 15-minute consultation calls, free samples that are inexpensive to ship, or anything that would convince users to subscribe.
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Synchronize your free members with MailChimp or another email marketing applications.
See our MailChimp Add On or browse all of our third party integration options here.
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Add email forms EVERYWHERE.
Add them to the bottom of your posts and pages. Use plugins like OptinMonster to ask for emails in a slightly annoying (but totally effective) manner.
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Set up a landing page to capture email address.
We have a video demonstration of this that you can view to learn more. Watch the tutorial here