Installous Not Working on Jailbroken iPhone 4 Running iOS 5?

Hello Rey, have you installed the latest version of Installous? Well, I am suspecting that you were downloading and installing the previous version of Installous, and that version does not support the new iOS 5 firmware. Or, an error occur might have occurred while you were installing the Installous. Anyway, you can refer on the tutorial posted below on how to install Installous 4.4.2:

Step 1: Launch Cydia app on your jailbroken iPhone
Step 2: Then navigate to Manage and then on Sources section to view your current Cydia repositories.
Step 3: Now select Edit button and then tap Add button on the top-left corner of Cydia (Just skip to Step 5 if you have already added http://cydia.hackulo.us)
Step 4: Then add http://cydia.hackulo.us as Cydia/APT URL then tap on the Add Source button.
Step 5: Once done, tap on Return to Cydia button to view Hackulous repo.
Step 6: Now tap on the Search tab at the bottom, type Installous in the search bar and then tap on Search button.
Step 7: From the search results, select Installous 4.4.2 and then tap on the Install button.

That’s it! You can now download cracked apps on your jailbroken iPhone on iOS 5. You will also need to download AppSync 5.0 in order to sync your device to iTunes 10.5.