EndNote X9 Compatibility and System Requirements
A note those who have EndNote on their Mac/Apple computers:
Apple released macOS 10.15 Catalina recently, and made the decision to drop all 32-bit application support with this release, which impacted EndNote.
EndNote X9 for macOS has been extensively updated to work with all Apple computers. If you already have EndNote X9, please install all updates as they become available to avoid interruption in your workflow.
If you are running EndNote X8 or earlier versions on an Apple computer running another operating system it is still suggested you upgrade to EndNote X9.