Originally Posted by matusman
Actually you can use both at the same time on the same domain if you wish. They are two different products.
The good thing you can also use each on a separate site. I am planning to do just that as I am in the same situation as you are. Just change url in the member's area and that's it.
Then I suppose that would mean you OWN two licenses. You may only install one product per license. You can not install multiple copies per license so regs is correct in his post. The licensing agreement is right here. PhotoPost Photo Gallery License Agreement