How to Install Visual Editor on Eclipse Helios?

Hey, I use Eclipse Helios in Ubuntu, and I'd like to install a plugin for 开发者_StackOverflow社区eclipse that works with swing. So, I found visual editor in this site http://www.eclipse.org/vep/downloads/, and I downloaded it. Now, I'd like to know hoe to install it. I tryied going in Help>Install new Software, but nothing. So if someone could help me with this, i thank you so much!

I installed WindowBuilder Pro.

If you download the packaged plug-ins and features, you can unpackage it then copy them into the dropin folder of your eclipse.

I found WindowBuilder Pro as the better option...