Do you have the install file on another computer or can you get it there? If you can then upload the install file to a SkyDrive or DropBox account and access it on your MacBook Air from there. If you have a friend you has the install file and they can
upload it for you, use that. Since you have a Product Key, you can use anyones install package.
Kind Regards, Rich ... http://greatcirclelearning.com