Instead of installing long lists of journal abbreviations you can edit your own journal entries by using the Term Lists functions

Check how your journals are displayed in a Word document

• If you want them to be abbreviated
• Go to your EndNote library
• Tools | Open Term Lists | highlight the journal you wish to edit
• Edit Term | Edit journal
• Continue to change other journals individually if necessary 

You will still need to use a Style that is designed to include journal abbreviations. Ask your Liaison Librarian if you have any problems