WindowBuilder Pro Eclipse is a tool for creation of RCP, SWT, and Swing UI's in Eclipse.
If you have previously installed WindowBuilder Pro Eclipse without using the Update Manager (e.g. using the WindowBuilder Pro Eclipse installer)
then you must first uninstall WindowBuilder Pro Eclipse before installing from this update site.
To install WindowBuilder Pro Eclipse from this update site
If you cannot drag the URL from your browser, then click the "Add..." button in the "Install" dialog
then copy and paste the URL into the "Add Site" dialog and click "OK".
If you add the URL but WindowBuilder Pro Eclipse does not appear in the list of sites,
then pull down the "Work with" field and select "All Available Sites".