Apps can download an extra 2GB initially, which happens immediately after install. A further 20GB can be fetched as on-demand resources, hosted on the App Store

Apps can download an extra 2GB initially, which happens immediately after install. A further 20GB can be fetched as on-demand resources, hosted on the App Store. The 200MB limit makes sense because it allows the OS to purge any old download-on-demand data when space starts to run out.