Bought it as a life time. I asked support there and they said I can renew once it will be expired but I have to contact Sharewareonsale.
I asked them do I have to do this everytime and they said yes. I think once there will be no contract from purevpn with sharewareonsale then they wont extend the account anymore.
In my view they are cheater!!!!
I would suggest not to by anymore PureVPN.