If you have the first-generation iPod Touch, you must update the device’s existing software to 3.1 before you can download and use applications available in the App Store. Many of these applications were created specifically for devices that have the 3.1 software update, which include the iPhone and the second generation iPod Touch. According to the official Apple site, the iOS 4 software is not compatible with the first-generation iPod Touch. However, the 3.1 software update is available in the iTunes Store, and costs $4.95 as of July 2010.
