You need to define one action for starting the Update-Manager。Then add the codes to the action’s run() method as follow:
UpdateJob job = new UpdateJob("Search for update", false, false);
UpdateManagerUI.openInstaller(window.getShell(), job);
PlatformUI.getWorkbench().getProgressService().sho wInDialog(window.getShell(), job);
In order to compile the code successfully, you must add the plugin ‘ore.eclipse.update.ui’ to the plug-in list in the dependencies , you can get the details reference to the link that I found it in :
ʹÓà Update Manager ¸üРRCP Ó¦ÓóÌÐò [×ªÔØ]_ÃÖÀ¼µÄ¹ÊÊ¡ª¡ª¡¶ÃÖÀ¼¾*¡·
I hope it will help you resolve the problem