I am using a Mac with OS 10.11.1. When I open the downloaded file on my desktop and I click on the red install icon in it, I get an error message saying that install is damaged and cannot be used. Isn't Adobe responsible for replacing such damaged software? Am I on my own to reengineer it?
The software on the Adobe server is fine. Most likely something happened during download. I would first try if downloading it again solves the problem. If not, you could try the following:
Right-click on the installer file and choose 'Show Package Content'. This opens the file as a folder, called 'Contents'. Inside the folder look for a subfolder 'MacOS'. Inside that folder you should find a file called 'Install'. Double click on it. If the installer is not really damaged, the Terminal app should launch and handle the installer instructions. Just follow the prompts as you would always do when an installer runs. After the installation is finished, quit Terminal.
Thank you so much for the explanation and solution. I successfully installed Photoshop Elements 9 and accepted it on a 30 day trial. I figured out how to do what I wanted to do on it and now I would like to buy it. How do I do that? (When I get this resolved I will download the OS X update.)