Installing Adobe InDesign CS4.

I have previously purchased the Adobe Creative Suite 4. The discs are no longer working, and I need to re-install the programs onto my new computer. I have had this issue in the past and contacted Adobe to email me a link for me to download certain programs from the internet. I have my product code or key code still, but am not able to use the discs to re-install onto my new computer. Can you please send me a link so that I may install Adobe InDesign CS4 onto my new computer.