1. Go here, http://v.appvv.com/
2. Download vShare (where it says "Download/Install")
3. Open the downloaded file in iTunes
4. Connect your iDevice
5. Go to the Applications tab
6. Select vShare from the list (click "install")
7. Sync
Done, you now have vShare installed. Note that you need AppSync installed on your device first in order to do this
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Download the app to your PC and open it in iTunes. Connect your device, select it inside iTunes, and go to the Applications tab. There should be a list of apps that you have on your computer and on your device. You just need to select the one you want to install.
Note: this will only work if you have AppSync installed, if you dont then download it first from Cydia
If you have AppSync installed on your iDevice you don't even need an app to install the cracked apps, all you need is to download the app and then sync your iTunes with the device.
AppSync is used to fool iTunes into thinking the cracked apps are actually official.
Anyway, i prefer vShare (App VV) over the other two
Relax people, there were always alternatives to Installous. You can even choose which one you prefer. Personally i like vShare better, but AppCake is also good.
Also, Installous used Apptrackr as source. Apptrackr is a website, and if you access it, you'll see that it's very similar to Installous, the only difference is that you'll need to Sync the apps you download with iTunes (though i'm not 100% sure it will still be up since Installous is gone)
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Bah, and here I was thinking they would be able to command sea life ...