The pack contains several collections, and each can be downloaded as a zip file at different resolutions depending on the version you bought: 8k, 12k, 16k.
The current collections are:
- Collection 1: a variety of scenes, including on Mars, above the sea, above a plain surrounded by rocky mountains, several cloud types without ground, in snowy mountains etc...
- Rough northern forest: a forest of conifers, seen from above, with eroded plateaus and mountains in the distance
The panoramas are standard HDR equirectangular images. They are each in their own folder, and their main texture is called equi_main.exr. The other EXR files are the different maps to be combined for color-tweaking.
You can read more in the documentation on the official website: