Thank you for reporting the issue.
We made some changes to the files.
Can you please re-download the .ai files from https://stock.adobe.com/Member/LicenseHistory and check if it works now.
If it is in your CC library, delete the same and re-download it and check.
This has been documented here. Adobe Stock Help | Troubleshoot Adobe Stock
Do let me know how it goes.
Thank you Arpit ... that worked. Customer is happy. We are happy. You can be happy.
Glad to hear that Jan
The file you are attempting to open can only be opened in Adobe Illustrator or Adobe Photoshop. You will not be able to open this in Preview.