If you still had CuP installed from when CP closed, you can open it now, and it should automatically update. Alternatively, you can download the installer from here: viewtopic.php?f=8&t=30.
Not all addins are working properly. Some are patched, and in those kinds of cases it will be up to the developer of that addin to fix it.
If you experience any other issues, please let us know here on the forums.