Eclipse Preferences do not contain an Ivy section after installing IvyDE

I installed 4 components from the update site http://www.apache.org/dist/ant/ivyde/updatesite mentioned on Apache IvyDE™ > Download including a restart of Eclipse:

• Apache Ivy
• Apache Ivy Ant Tasks
• Apache IvyDE
• Apache IvyDE Resolve Visualizer

They are displayed in Help → Installation Details → Installed Software.

There is an Ant section but no Ivy section in Window → Preferences.

Is there anything else I have to do?

The only solution I found (and I didn't find it, in fact, I tried it because I didn't find any other solution) was to:

• abandon the Eclipse workspace (losing all the settings and plugins I've installed so far, of course)
• create a new one from scratch
• install the IvyDe plugin as first step before doing anything else