Sorry to hear about the trouble you are facing. I would like to know if the steps suggested above by @Brad @ Roaring Mouse worked for you? If not, I would request you to share a few more details like:
OS and version of Illustrtaor
Did you tried downloading the file on your system and then opening it in Illustrator.
Sorry to hear about the trouble you are facing. Could you please share a few more details like:
OS and version of Illustrtaor
Does the file open in Illustrator if you download it to the desktop?
If it does not open from the desktop, then could you please share the document with us? You can upload it to the Creative Cloud (https://helpx.adobe.com/in/creative-cloud/help/share.html) and share the download link. We'll be happy to look at it.