Need to install Elements 12 onto new computer [Mac]

I previously bought photoshop 12 on cd and installed on my mac.  I just purchased a new mac and need to install it on my new mac.

There is a version there but it will not open.  It appears to be out of date and I cannot uninstall it either.  It says I need to update in order to do that.  But I cannot find the update files.  Is there anyone here who might be able to help me with this problem.