When do I formally "Own" an app from App Store? I'm new to this community. I have some simple question but I can't understand why nobody else ever asked them with below scenario.

My Scenario


As all we know, sometimes developers make their paid apps, free for a limited time.
I unfortunately  have a Limited internet in home.


* What I do in this situation is that I "Get" this temporary free apps, and after about 1% of downloading I pause them in order to resume downloading later. *



Notice that all below questions are related to each other like a chain and It's not sensible to ask in three separate question.

My Questions:


When I formally "own" an app (if it's free or paid)? right after pushing the "Get" button in App Store OR when downloading has completed ?
(According to above story) Can I resume this downloads (also when apps get back to paid mode) ?
If this temporary free apps become paid again, Will I still get new updates for ever since I own them ?


PS: when somebody "purchase" a paid app, he is "owner" of that app. In this question I used word "own" in the meaning of "possession".
Once you tap Get, then confirm it by tapping again, then entering your Apple ID or using Touch ID, and the download starts, then you own it.

The download starting is important—if there's not enough space on the device, or the network disconnects first, or anything else prevents the circular progress bar from starting, you don't own the app.

Once download has started, you can tap the Stop button to stop the download. The icon changes to an iCloud download icon and you now own the app.
You can download apps you own from the Purchases list found at the top of the Updates tab on iOS.
Once the app has been added to your Apple ID, the app will remain on the list regardless of whether the app developer changes the price tier of the app. It won't be removed if the price increases and you can't be charged in the future.

This also applies with part 2, as if you purchase the app, then delete it, you can download it again without being charged even if the price tier increases.