Set your Google Scholar preferences to export citations directly into EndNote.
The program should do the rest!
Note: When you add references to an existing EndNote library, you might see only the most recent entries. Choose References > Show All References (Ctrl+M) to get back to your entire EndNote library.
Caveats: You can only download Google Scholar citations one at a time. Basic information (author, title, source) is downloaded; however, abstract, keywords, author affiliations, etc. are not. Check the EndNote record for accuracy (e.g., Reference Type; journal information) and adjust if necessary.