You can create an EndNote online account that enables you to work with your EndNote Library through any Web browser.

Using EndNote while away from your computer and your Endnote Desktop software (Note that the Style Finder page also provides instructions on how to install all styles, or install styles by category).

EndNote ships with 7000 popular styles. To add your favorite journal to your EndNote, use the Style Finder to find your style, then follow the instructions on that page to download and install.

I am currently not using my old endnote and using Mendeley instead until the new one comes, usually There is pre release period in which you get free upgrade to the new version for free so getting it month or so early not worth it. so not the macOS only but words and other softwares connected to the endnote

I remember before even the new office had issues with endnote and we had to use old version of office for few months before they do fix it. and to be hones usually the best way for security and speed/stability I would prefer updating my macOS and I have other software that will need update so my life won't be stuck with the endnote X9.

The thing with macOS is that all new MacBooks will have the new MacOS, also apple push hard toward updating their OS. ***The new endnote will have full support for at least two years and will be more compatible with the new MacOS

***X9 limited support and long time to fix the issues and will be outdated. Here is the unfortunate fact based on my experience and others, The company won't stand behind the old product as they want us to buy the new version so the following will happen:

Purchase endnote for mac