If you want to use Aerial on a Mac behind a firewall or with no network access, the easiest way starting is to copy the content of the cache folder from another Mac where Aerial is already installed.
If that's not an option, you can manually recreate a cache folder by downloading files manually.
- Download and untar
https://sylvan.apple.com/Aerials/resources.tar
(tvOS12 resources, keep the tar and extracted files) - Download and rename
https://sylvan.apple.com/Aerials/2x/entries.json
totvos11.json
(tvOS11 resources, also in 4K) - Download and rename
http://a1.phobos.apple.com/us/r1000/000/Features/atv/AutumnResources/videos/entries.json
totvos10.json
(The original Aerials, in 1080p H.264 only)
You can then download the videos you want from the JSON files. In the 4K JSONs, you are looking for the url-1080-H264
(1080p H.264, most compatible format), url-1080-SDR
(1080p HEVC, better quality, requires a recent Mac for hardware decoding) or url-4K-SDR
(4K HEVC).
Please try to download the videos in the order mentionned (tvOS12 first) as videos routinely gets replaced with better versions. Because you will be downloading files manually, you will end up with many duplicate versions of the same videos. You can clean them up by going into the Advanced
tab and use the Trash old videos
feature there. You can find more information about the process in this issue