Fix Installous API Error [Guide]

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The API error, Perhaps the most common error in Installous on iPhone 4, 3GS, iPod Touch 4G, 3G, iPad 2 and iPad 1. The error message is “API Error API unavailable” or “API Error API Permission Denied”

Installous lets you install cracked apps on your iOS device by downloading the .IPAs of the apps and install it directly to your iOS device. There was rumors that Installous will be blocked in the iOS 5 Untethtered Jailbreak. We will see about that when the jailbreak sees the light.
What Is Installous API Error?
This error happens because of a problem with AppSync compatibility. So the key in fixing that error is uninstalling and re-installing AppSync.
Fix Installous API Error [Guide]

Step 1: Uninstall AppSync. Open Cydia > Manage > Packages, then open AppSync , Modify > Remove > Confirm.
Step 2: Reboot your device
Step 3: Install AppSync. Open Cydia > Sources > Hackulo.us then install AppSync. (You can get it from Cydia Search too)
Step 4: Install Installous. Open Cydia > Sources > Hackulo.us then install Installous (You can get it from Cydia Search too)
Step 5: Open the real App Store and install any free app.
Step 6: Open Installous and start installing apps without API error. Enjoy

LINK here