Serial number problem after upgrade to Mavericks

Question

My old CS5 Photoshop v. 12.0.4 works fine in an old Mac computer with OSX Snow Leopard, but after transfer to a new Mac with OSX Mavericks whenever I try to open Photoshop it asks for a serial number I no longer have. Bought Photoshop years ago, never registered it because I only had dialup internet in those days (and my rural DSL line still crawls at 1.5 speed), install discs and box are nowhere to be found and I don't want to upgrade to a newer version. Just want to use my old Photoshop like I did before, without Cloud or any other nonsense. Can I I get a new serial number or how do I activate it?

Answer 1

If you lost your serial number, your proof of purchase and also failed to register your product, there's not a lot we can do for you. Sorry.
If, however, you lost your serial # but have the product installed and activated using a genuine serial # you can launch Photoshop and select Help>Product Registration... to register the serial # with your Adobe ID. You can then log into your Adobe account on Adobe.com to retrieve your serial #. (Note: It takes about 5-10 minutes for the serial to show up in your My Products of your Adobe account when you register this way)
http://www.adobe.com/support/registration.html
Other purchased products: From within your product, choose Help > Product Registration. (You don’t need to have your serial number when you use this option.)