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Just updated it!
Why didn't you share the URL to sign up in the article
Karim Abou Shousha, an Environment Artist and Lighting Artist at Dekogon, has shared a nice pack of free materials for Substance Painter.
The pack features some wood, glass, wall and other surfaces which you can use for different kinds of scenes.
Also, make sure to visit his ArtStation page to find substances and check out his inspiring works.