According to Adobe, you should still be able to register your CS3 program via the internet. If not, I would suggest you contact Adobe Tech support.
Some information from Adobe:
https://helpx.adobe.com/creative-suite/kb/cs3-product-downloads.html
You need your CS3 serial number to complete the installation. To find your serial number, sign in to your
Adobe account. On the Manage Accounts page that appears, all of your registered products and their serial numbers are listed in the Plans & Products section. For more information on locating serial numbers, or on registering a serial number, please see
Find a serial number.
Good Luck.
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