Im considering buying an XPOR licence however i need to know that it will last for a long time and will not stop working after say a year. How long does the licence last for and how often do i need to renew it?

Once you have bought an XPOR licence it is yours forever. There are no repeat fees or need to renew with the licence. However XPOR needs to be hosted which is a recurring cost for as long as you want your site to be active.