http://bugs.winehq.org/show_bug.cgi?id=12109
--- Comment #2 from Daniel Kammerer d_kammerer@web.de 2008-03-20 02:31:22 --- The update is a *.msp file, you can download it from: http://www.endnote.com/support/ENX101_Win_updater.asp
I tried it on a system without the actual endnote program and get the same error. So you can test the update wihtout having an endnote license.
I used the command: wine msiexec /p *.msp