EndNote X9 for macOS users
“This library was created using an earlier version of EndNote and needs to be converted for use with this version of EndNote. A new, converted library will be created that can only be used with X9.3 and later, but the original library will not be changed. To continue using the library in X9.2 and earlier, use the original library or use EndNote sync. Continue with the library conversion”
EndNote X8 for macOS users
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