There are be two possible reasons why a purchase may not show in a customer account.
The payment of the purchase may have not be complete yet, at least within JVZoo. If the information is not being sent back to JVZoo from PayPal, then JVZoo is unable to deliver the purchase at this point. You will need to contact the seller's support desk directly to find out if they did receive the payment in their payment account. If so, they can set you up with access to their program directly.
The other possible reason you are unable to locate your purchase is that you created a new account by entering a different delivery email address then you previously used when ordering a product through JVZoo, or there was a typo in the delivery email field on the checkout page. What you enter in the delivery field is what creates an account.
If you need assistance determining which account the product is located in, or you are unable to locate your purchase please open a Support ticket. When opening a support ticket be sure to include your Paypal email, delivery email, and if available your transaction number.