Usually if you see the "Download Complete Set" button on a set in the Marketplace, that means you have purchased that set. Also, the system will not let you double-purchase the same set (for the same account) and if you try it will give an error telling the reason. You can see what sets you have purchased in-game in-tabletop, under Art Library > click Premium Assets > Marketplace Purchases. Your sets purchased are listed by name(folder) and showing the art, here. <a href="https://wiki.roll20.net/Art_Library#Premium_Assets" rel="nofollow">https://wiki.roll20.net/Art_Library#Premium_Assets</a>...