Mandatory email subscription to purchase product

I am looking to make an existing e-product on the website free to customers, however only able to receive the PDF download if they have entered their email to subscribe to the newsletter.

Currently Woocommerce is linked with Mailchimp which gives a “Subscribe” checkbox on the checkout page, however this checkbox is optional and someone would be able to untick and continue going through to receiving the free download.

Is there any way to implement a mandatory email subscription sign up with Mailchimp to receive the downloadable pdf?

Thanks

 

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