All content upgrades have a direct link. This link bypasses the subscription process completely. So if you ever want to give someone the URL to a content upgrade without requiring/checking that they’re subscribed, you can do that!
Edit your content upgrade and look for the “Content Upgrade Information” box on the right. Find the box for “URL” and copy the contents. This is your shareable upgrade link.
But remember: people who use this URL will not be subscribed to your mailing list, so make sure you know what you’re doing! 🙂