When you find the app you want to download, tap its price (or tap Free), then tap again to get it. If you’ve previously downloaded the item, appears instead of the price and you won’t be charged again.
In App Store, tap Updates and then tap Purchased to display a list of all your purchased apps. Tap Not on This iPhone to see apps available to be installed on your current device. Tap to download and install the app.
After upgrading a Software Update Server from OS X Server (Mountain Lion) to OS X Server (Mavericks), it might not be possible to serve software updates for OS X Mavericks clients.