I just recently bought InDesign Cs 6 student version for Mac from amazon.com. When I go to download the program it comes up with a connection error. I have contacted Apple and all my settings are correct. I am also able to connect to the interest and use my web browsers.
If you bought it from Amazon you'll need to contact them about download
You did not mention where you tried to download from. Officially, CS6 is not available for download from Adobe's websites anymore. However, there is surely still some link or hidden/buried website on Adobe's, but where to find?
Try it from here: http://prodesigntools.com/adobe-cs6-direct-download-links.html
All that matters is your serial number. You should be able to install ID with that installer and your serial.