If you are trying to download The Agile PrepCast™ on your iPad or iPhone, you can use Apple's app for podcasts. Read the information below for details.
Apple has its own "Podcasts" App. Simply subscribe and download podcasts from the Apple "Podcasts" app. You can even sync your podcasts and played status and position with another iOS device (between your iPhone and iPad, for example).
Apple also identified specific steps here that you can follow to sync between your Apple devices.