As you may already know Hackulous the famous hacker group behind installous and app sync for installing cracked apps on iOS devices has been closed. So if you need cracked/paid apps for free you might use some other cydia apps like appcake to install crack apps on iPhone. There is new method i have found lately which will actually let you install paid apps for free on iPhone, iPod touch and iPad for free with out jailbreak. Means you can install paid apps free on iPhone 5 and iPad 4 which are still NOT Jailbroken.
The whole method has been explained in the video posted below, before you continue kindly read the summary for this method.
Please sign in with your apple email ID on your iPhone iPod Touch or iPad before you begin.
1) Download the software called Kuaiyong from here:http://www.mediafire.com/?ls2ab5eli280js1
2) Launch the setup of Kuaiyong, and install it (simple setup)
3) After Installing the Software, plug-in your iDevice with USB Cable.
4) Launch Kuaiyong.
5) Watch Video for the interface of this program. You can search for a particular app in it as well. The names are tricky but with a little effort you will get used to it.
6) Once you have selected the app to download, hit ‘Red’ button as shown in the video. Wait for it to download.
7) After download is finished, your App will be sync to your iPhone/iPod Touch or iPad automatically.
Note#1: This works on all iDevices including: iPhone 3G, iPhone 3GS, iPhone 4, iPhone 4S, iPhone 5
Note#2: This also works on all iOS Versions: iOS3, iOS4, iOS5, iOS5.1.1, iOS6, iOS6.0.1
Note#3: If the program asks you to sign with your Apple ID and then crashes then Please turn off your wifi on your device. Also turn off its 3G/4g or Edge network (Cellular Data) in your Settings then General then Cellular/Network. Then install/re-install app.
Disclaimer: This is done only for Developer Purposes. So be nice & keep it clean.