I have never not received my gold for downloading an app. Did you open the app and keep it on your device for 2 minutes? And some apps require you to do something in the app to get the gold. Just read the requirements.
You will still be able to play the game. But there is a possibility that it just won't be updated. Every game eventually ends at some point. And everyone is just guessing. So there isn't any point in getting upset.
18.5 million should be enough for the region 7 weapons if you don't buy any of the gold weapons. The gold weapons are a lot more expensive than the cash weapons. And the region 7 bow did cost about 7 million to fully upgrade.
Go to Tapjoy.com. You can download a lot of apps. Some as high as 28 gold for one app.You just have to download the app and keep it on your device for 2 minutes and than you can delete it. That is how I earned the majority of my gold.
I updated my iPhone 5 to iOS 8 last night. Didn't have any issues with DH14 or dino hunters. I am hoping when I get the iphone 6 plus it will go that smoothly. But I am planning to keep my old iPhone if it doesn't work.
There was a 50 free gold offer for Dino Hunter, it was for Facebook players about a month ago. But I think that offer is over with. I have not seen anything mentioned recently about a new offer on the forums.