If you already have a Newzik Pro subscription (monthly or yearly) and want to upgrade to a Lifetime licence, please follow all the steps below:

1- Open the account view

2- Tap on the "Plan" subsection

3- Tap on the Manage subscription button

From there, the paywall window will display and let you purchase the Lifetime licence.

4 - Cancel your current subscription 

Paying the Lifetime licence does not cancel automatically your current subscription. You have to manually cancel it as explained here. 

Important note: after paying for your lifetime licence and cancelling your subscription, you will see from your account your still active subscription offer. This is normal! When the expiration date of your subscription arrives, the lifetime offer will take over.