The latest Mac operating system, Catalina, runs only 64-bit apps. While the original version of EndNote X9 is a 32-bit app, the latest EndNote upgrade is a 64-bit app. If you have EndNote Desktop on your computer and have not yet upgraded to Catalina: 1. Upgrade your EndNote to the newest version (X9.3.2). InContinue reading “Got EndNote Desktop? Got Mac? | Read this before upgrading to Catalina OS”