In App Purchases (IOS) - From Paid to Ads


Not really a pure Ionic question, but since I have developed the app in Ionic, I am asking anyway.

I’ve got an application that now is a paid app, and some 40-50 people have bought it. Now, I’ve changed this app to contain ads, and in-app purchase to remove the ad. How would I go about to change this in the app store, so that the people that already have bought my ad, still will receive an update with ads removed?