The Library provides some modified and additional Filters, Connection, and Styles files.
Note that any zipped files need to be 'unzipped' i.e. right-click and choose the extract command. Copy these files to your EndNote file folder location.
If you just need the APA 7th style, note that this is not 'zipped'. Just save it into your styles folder.
C:/Progam Files (x86)/EndNote X9/Styles
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
You will still need to use a Style that is designed to include journal abbreviations. Ask your Subject Librarian if you have any problems