Before proceeding it is recommended to perform the following checks:
You must use Eclipse 3.2 or newer.
To check the Eclipse version use menu Help > About. In the snapshot the Eclipse version is 3.2.

You must use Java 1.6 or newer.
To check the Java version use menu Help > About, then click on Configuration Details. In the snapshot the Java version is 1.6.

To check the DVT plugin is installed use menu Help > About. You should see the DVT button.

To see more details, for example the version, you click the button.

To check the DVT license go to menu Window > Preferences and inspect the DVT > License.
The DVT license is pointet to by $DVT_LICENSE_FILE system variable.
