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Below, you can see that there are 5 buttons you can tap. Home, Browse, Search, Downloads and Updates. I will explain each part.
Home- the home screen. Features updates and information. Settings is accessed here.
Browse- it is like "Categories" on the App Store.
Search- search for apps you would like to download.
Downloads- the apps you downloaded from Installous. Shows current downloads and past downloads.
Updates- shows the updates of the apps you downloaded through Installous.