hey excuse because im still a newbie with such things on installing apps on the ipad...now i used to install my apps from the appstore with a username and a password.anyway ive got a dvd that has ipad applications in it..obviously the are .ipa format. so i inserted the DVD, i went into itunes with my ipad connected...i transfered my purchases to avoid losing previously installed apps. I have also put the DVD apps in the library ( by double clicking on them, they are inserted by themselves ).. so when i was syncing my apps i chose what i want ..the thing is that the old ones are installed fine, but the ones from the DVD keeps giving me an error that failed installing the app.... could you please tell me what could this be for ? could it be something missing or could it be a fault from the DVD itself.. another thing is that is there another way for installing those apps from the DVD without losing existing ones ? =D