I have just purchased a stock image. I have been able to download it, but unable to open the image (possibly the computer does not recognise the extention .ai)
The image is Order details: Order #AD004383273NZ Please help.
An .ai file is an Adobe Illustrator file so you need a program that will support Illustrator files if you don't have Illustrator. If you are a Creative Cloud Subscriber you will have access to Illustrator or Fireworks. You can also maybe send the file to someone that has Illustrator and can save the image in a format you can use.
This seems to be a fairly common problem. While the site does state it is an .ai file it should also list compatible Adobe Apps that support it. I hope that is something they will fix once they get rolling.