It can take some time (up to a few hours) for the money to pass from your paypal account, to paypal, to the Unity Asset Store paypal account. You will not be able to download the asset until the money reaches Unity. Just because the money can be seen to have left your account does not mean it has reached Unity. If after a few hours you still cannot download the asset, use the contact form at:
http://unity3d.com/contact/get-in-touch
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