But why you can’t do an addon to download, just as the new Scenery?
If I was IPACS I would tend to split the game into in-app purchase regions. The game would contain California by default and the user would pick amongst HighRes regions between Utah $0, Colorado $0, Nevada $0, Arizona $0, Florida $0, England $0 and Switzerland $pr ice.
I would do the same with liveries, some by default and other as in-app purchase free or not.
If you have free space in your device you download all. Regions could be SD or HD in function of the free space.