A Starry Night installer installs multiple components.
Here, I'm using Pro Plus as an example.
There are 5 components included in Pro Plus: Starry Night Main App, Basic All Sky Image Data, Panoramas, Planet Images, and Additional All Sky Image Data.
1. Starry Night Main App and Basic All Sky Image Data
These components are required.
Users cannot unselect these components, they must be installed.
Users CAN change the installation path of these components.
2. Panoramas, Planet Images, and Additional All Sky Image Data
These components are optional.
Users can choose not to install these components.
Users CANNOT change the installation path of these components, they can only be installed to the default path.
3. About the All Sky CCD:
The basic All Sky Image Data includes low resolution, wide angle FOV image (tiles) data (i.e. the 180 degree view of the night sky using the All Sky CCD).
The additional All Sky Image Data includes high resolution, narrow FOV image (tiles) data (i.e. what you see if you zoom in tight on M42) .