Aerus releases have different user interfaces that contain different features. The latest user interface is Release 2.4.
Older releases include Release 2.3, Release 2.2, Release 7.1, Release 6 (historically known as the "new" user interface) and Release 5 (historically known as the "old" user interface) . In Release 6, you could return to the Release 5 user interface. That capability was deprecated for Releases 7.1 and later.
Release 2 User Interface
If you have Release 2, your user interface looks similar to this:
Release 7.1 User Interface
If you have Release 7.1, your user interface looks similar to this. The idle page and the toolbar (shown "faded" on the second screen below) are new in Release 7.1.