Other reason for using Installous is to have a trial version of a software without buying it first, something that it's not possible in AppStore. When you wanted to download an application (even for trial), if it's a commercial app, you would have to pay for it. Installous can solve that problem by enabling you to download the same software but from third party repositories.
Right now, Installous has been upgraded to Installous 5 and it brings some new features such as:
- Added BitTorrent download support
- Support for iOS 5 notifications
- Better filehost compatibility
- Bug-fixes and optimization
Here's some disclaimer about the use of Installous:
Downloading and installing cracked apps are illegal. We don’t support or promote piracy in anyway. This article is purely for informational purposes only. The whole purpose behind cracked apps is if you would like to try an app before purchasing from the App Store. It is expected that you either delete the app after testing it or purchase it from the App Store. Please give credit to the author of the apps who have spent hours, days, months making and testing the apps to make sure the users gets the best experience when using their applications.