How do I reinstall Photoshop CS4 on a new Mac?

About three years ago, I bought Photoshop CS4 for my MacbookPro. I just replaced the computer as it was on its last legs, and I'd like to reinstall my Photoshop software. I have the disk, serial number, everything, but I can't just pop the disk in because the new Macs don't have a CD / DVD drive. Go figure.
I'm trying to figure out how to do this through the Adobe website, but I'm not having any luck. Any suggestions?
Thanks!!

Okay, that makes me feel a little better. Thank you.
I followed the Very Important Instructions and downloaded everything so it's on my computer, but when I go to open "Setup" it gives me a message that says that the application is from and unknown developer and cannot be opened. I'm going to try downloading it again because maybe I missed the cookie step, so I'll see if that changes anything.
Edit: No, it's still saying it can't be opened because it's from an unidentified developer.. Any idea why that's happening?

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    Please help how do I reinstall photoshop elements on a new computer

    Hi thanks very much for that tip will do once I know it is running ok nearly finished download now
    Sharon
           From: hatstead <[email protected]>
    To: Sharon Roberts <[email protected]>
    Sent: Monday, 27 April 2015, 20:03
    Subject:  How do I reinstall photoshop elements on a new computer
    How do I reinstall photoshop elements on a new computer
    created by hatstead in Photoshop Elements - View the full discussionOnce you have it working satisfactorily on the new computer, it is probably wise to deactivate the software on the old machine. The license is for two installations only. Sent from my iPad If the reply above answers your question, please take a moment to mark this answer as correct by visiting: https://forums.adobe.com/message/7486467#7486467 and clicking ‘Correct’ below the answer Replies to this message go to everyone subscribed to this thread, not directly to the person who posted the message. To post a reply, either reply to this email or visit the message page: Please note that the Adobe Forums do not accept email attachments. If you want to embed an image in your message please visit the thread in the forum and click the camera icon: https://forums.adobe.com/message/7486467#7486467 To unsubscribe from this thread, please visit the message page at , click "Following" at the top right, & "Stop Following" 
    Start a new discussion in Photoshop Elements by email or at Adobe Community For more information about maintaining your forum email notifications please go to https://forums.adobe.com/thread/1516624.

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