Problem:

The application could not be installed because the AIR file is damaged. Try obtaining a new AIR file from the application author.

Solution:

Between each step you can try again to install again.

1. Make sure your date/time is correct on your computer.
2. Disable any download accelerators, 3rd party anti-virus or anything else you may think interacts with the file while being downloaded.
3. Delete the downloaded file from your computer, clear your browser cache( https://kb.iu.edu/d/ahic ) and re-download the file.

If all of the above fail for you, open up a ticket and let us know.