Please advise Thomas Bain
CS2 was created for the Power PC processor which your old iMac obviously was.
Your new Mac with OSX 10.9.5 is an Intel Mac and no longer runs Power PC applications.
For several years after the transition from Power PC to Intel Apple had provided an emulator called Rosetta that allowed Intel Macs to run Power PC applications.
However, the last version of the Mac OS that had Rosetta was OSX 10.6.8 Snow Leopard.
Even if you could find a copy of OSX 10.6.8 it would be highly unlikely that it would ever install on a newer Mac due to different firmware versions.
Your only hope is to buy an older used Mac that can run OS 10.6.8 Snow Leopard or earlier.
Sorry, but that ship has sailed.
You could probably set up a virtual machine on the new mac to run the old OS, but your CS2 disks will no longer work because the CS2 activation servers have been shut down. Registered users can download a non-activation installer from Adobe - CS2 Downloads