You will need to go to another website where the downloadable file is located. Adobe's website will only have the most current version on their website.
Photoshop is Typically used mostly for raster image editing where Illustrator is used for creating new vector images from scratch... For Example: You could use Illustrator to make pictures for a...
It depends entirely on the project - Photoshop is an image and graphics creation and editing tool, based on pixel files. Illustrator is an original artwork and design program that is based on vector...