I have been having problems downloading OS4 for my Ipod, but it goes for ipad and whatever with itunes it could be an app, if you land up that it downloads so far or it downloads to just the end and then it tells you it has had a problem downloading to check your conection and you get an erro message 3259 its a time out, the problem could be down to your computer virus protection, disable it for the time you need. I have never had this problem before un till with my network which is sky, i was with cable and no problems. my virus program is NOD32. If you have problems where it times out on itunes then try this. It worked for me.