150MB Limit

I am trying to download Hearthstone from the app store. It has an update over 150MB. How do I download it with out using wifi?

Also why is this even a thing? I mean I have been googling around and I see that you can change your date and time or something but why isn't this something easy? I thought Apple was suppose to have ease of use but I can't download an app over 150mb on cellular???? I mean this is 2018. People pay over 1000 dollars for a phone. Plenty of them will have unlimited data. I want to update my games when I am using my phone at a store or airport. And that would be when I am not no where near wifi. Also I do not like putting phones on my personal wifi at home since I am already drawing so much traffic and ip addresses through my modem I have to already reset it weekly. I think this is an out dated policy the app store has. Maybe its because it might lower traffic on their end and their servers are trash or something?? but I don't see any good reason this should still be around in 2018.