On the product page on the right side, look for the product information (license, code, etc.). If you have previously purchased the item you are viewing, the purchase date will be noted. I've highlighted here to show you the location:
PLEASE NOTE: You must be logged in for this feature to work, and it must be exactly the same product. For example, if you previously purchased a bundle and now you're trying to buy the kit, the system will not warn you.
If you add the product to your cart, a pop-up will alert you that you have already purchased this product. You may still purchase it if you proceed normally, but if you did not intend to purchase the same product again simply remove it from your cart.
Alert:
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