If you have already upgraded to Catalina or Big Sur before updating your EndNote program to EndNote X9.3.1, the EndNote app will be disabled in the Applications folder. Please note that when you open an existing library in X9.3 and later for Mac, it will create a converted version for use with this new database engine. Ideally, you should manually install the update BEFORE you update to Catalina or Big Sur. EndNote has released an update to solve this problem.
These new operating systems are incompatible with older versions of EndNote. Apple has released two new operating systems, Catalina and Big Sur.
