I have released a free app on the App Store, and some users have already downloaded it. Recently, I want to change this app to a paid app. I would like to know if users who have already downloaded the app will need to pay for it. I understand that if users still have the app on their device, they can update it for free; but if users have uninstalled the app, will they be required to pay when they download it again?

Hi, I am new to StoreKit and IAP. I am developing the 1.0 version of my app, and I plan to offer non-consumable items in version 1.0, with plans to offer auto-renewable subscriptions in the future 2.0 version. According to the App Store's review requirements, when I add a new type of item in the app, I need to submit the app version for review as well. What I want to know is, after I add auto-renewable subscription items in App Store Connect for use in version 2.0, will these new items be returned when my 1.0 version queries product information through the StoreKit interface? If they are returned, since version 1.0 does not support auto-renewable subscriptions, do I need to add compatibility code to ignore the unsupported items? Ideally, according to the App Store's requirement to submit a new app version along with the type of products, StoreKit would help filter out product types that are not supported by older app versions, but I wonder if this is the case?