How to update apps without having to download the whole thing again?

[mohit9206]

So we know that in Android, whenever an app needs to be updated, you still need to download the whole thing again. I don't understand why can't apps just download whatever changes are needed. Usually i haven't had a problem with this as i mostly use low size apps and don't update frequently(turn off auto updates).
But i am looking to download a game from Play Store that's over 100mb in size, so i wish to know, when if the game requires an update, will i have to download the whole game as update again or just what needs to be updated because some games don't allow you to play online without the latest version installed. I mean i don't have unlimited data plan so its an issue for me.Running stock kitkat 4.4.4. Thanks.

 

[Golfdriver97]

Most do just download the updated part. I have had plenty of times when a larger app starts downloading gets to a certain point and it's installing.

 

[jamaica168]

Yes, google changed it quite a while ago that only the part of the app that is updated gets downloaded .