It is being downloaded as an .ai / EPS file. Other images I've purchased are downloading as a jpeg. Why is this one image different from the others?
It says Adobe Reader could not open 'AdobeStock_28589586-4.ai' because it is either not a supported file type or because the file has been damaged (for example, it was sent as an email attachment and wasn't correctly decoded). I do not have adobe illustrator installed on my computer (2014 Mac-pro), but want this file as a jpeg or pdf.
.ai is an Illustrator or vector file. You don't need illustrator but you will need program that can open them. Adobe Fireworks is another that should open the file. In order to read it as a PDF you will have to create a new PDF and import the image into it.