The Modeling Package is one of the Eclipse pre-packaged distributions available from the download page (http://www.eclipse.org/downloads/).
Once you have downloaded and launched this package, just click on the "Install Modeling Components" button from the toolbar.
This button opens a window displaying all the available Helios Modeling components. Select MoDisco and click on the Finish button.
A wizard appears to display all the MoDisco components which will be installed.
Click on Next, then click on the "I accept the terms of the licence agreement" to finish the installation.
Restart Eclipse and it's done! You have now access to the features provided by MoDisco 0.8.
Some of these features are directly available to manipulate or create EMF models, without having to write a line of code:
In addition, as a platform for Software Modernization projects, MoDisco also provides a lot of components to help you in the development of model-driven reverse-engineering tools.