How to re-install Photoshop CS on new iMac? [was: Installing]

My old PC crashed and died and I lost all of my files and programs.  One of the programs I lost was Adobe Photoshop CS.  I talked to a chat tech and she sent me a free link to re-download the program.  It download ok, but it will not install.  I now have a iMac and the file download was a Mac version, but it will not install.
The message reads: The software is an unidentified developer.

The message reads: The software is an unidentified developer.
What Ned said.
That error/warning is from the new Gatekeeper feature in Apple's Mavericks operating system. It's not from Adobe.
Gatekeeper is supposed to protect you from malware but it often causes more problems for the end user (like this) than it solves.
Having said all that, you will not be able to install Photoshop CS2 (the link you received to re-download CS was actually for CS2) on your new iMac running Mavericks (OS X 10.9+)
https://www.adobe.com/cfusion/entitlement/index.cfm?e=cs2_downloads
CS2 and earlier versions were written for older Macs running older non-Intel processors. Macs stopped using those several years ago. They now use Intel processors which are not compatible with the older processors.
CS and CS2 (10+ year old software) will only install and run on older (10+ years old) Macs running Mac OS X v.10.2.8–v.10.3.8. PowerPC® G4 or G5 processor. There is no version of CS or CS2 which will run on modern Mac operating systems.
With your new iMac running OS X Mavericks on an Intel processor, your choices are to buy CS6 or join the Cloud and pay the monthly fee to run CC.

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