I am by no means an expert in this field, but I am conscious how frustrating it can be; waiting for someone to answer with advice.
Option1/ Do you have some anti-virus software active (I guess Norton)? This will delay the download and might have prompted the time-out message. Could you disable the software and try then?
Option2/ If you went through D2D, do you have it on a Download Manager? I'm just thinking that there might have been a corruption which is causing the error. Could you delete the program file and complete the download again?
[Disclaimer: I have VERY limited technical knowledge and am simply offering this as what I would do.]