Adobe Creative Suite 3 Activation [CS3 is dead & gone]

The hard drive in my Mac with CS3 died and I had to reinstall everything. I have the original DVD and serial, but it won't activate over the internet or by phone. I read in the forums that the activation servers for CS3 had to be shut down. How can I use my software? I realize that it is over 10 years old, but I have invested several thousands of dollars over the years in Adobe software and I expect to be able to use what I purchased. I already have a CC subscription for my new Mac, but I still need to use CS3 on my old computer. Thanks in advance for any help!