He’s doing it through the Gunroad store. The discount code is HDG4FREE.
It’ll ask you to enter an email address, but only to send you a receipt – even if you put a fake one it, it’ll take you directly to the download page.
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You could also use a tempmail for the email https://adguard.com/en/adguard-temp-mail/overview.html
BTW do u know what the difference between the two PDFs they offer is?