If the plugin does not work as expected after an update, then please follow these steps:
Delete the jar from the plugins folder completely and restart eclipse.
Put the jar file back in the plugins folder and start eclipse again.
If the update site does not work, download the plugin .jar file from here
and put it in plugins folder of the eclipse installation directory. Then try the update site again. One needs to uncheck the group items by category at the bottom
as shown below.
If the configuration screens seem messed up, please reopen the preference page. This should take care of it most of the time. If not, restarting eclipse will definitely take care of it.