When I download CS4, it won't open. "

"Setup"cant be opened because it is from an unidentified developer" is the message that pops up when I try to open the disk image.

That is a message from the Gatekeeper feature of your Apple Mavericks operating system. Nothing to do with Adobe.
For workaround, see Error "has not been signed by a recognized distributor" | Launch Adobe applications | Mac OS

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