erm .. what does your paypal receipt say? I'm not sure about paypal, did not know they still allowed paypal payment. But for Credit card you will see as described at bottom of this post Upgrading to V 4.18 (click on link). When did you purchase it exactly?

On your receipt you should see paid to Lime Wire LLC. If that's not the case, then sounds like you did not purchase from the 'official' site.