"Install" can't be opened. You should eject the disk image.
I am trying to install a previously licensed version of CS5.5 onto my new Macbook Pro. I logged into Adobe Worldwide Licensing and tried to download the installer, both via the "Download" and "Download Manager" buttons. I get as far as completing the download, opening CS5_5 Design Std folder, double-clicking "Install", and then receive the following error in a popup:

I'm not sure what to try next - any help would be greatly appreciated!
