Hello, @endix ,
We are planning a release for later this year to address 64-bit compatibility; we are developing it now. I can’t say yet if it’ll be a beta first, or just a general EndNote X9 for macOS update. I also can’t yet give an exact release date, but it should be before Apple’s own release, unless Apple changes their usual timing.
As more information becomes available, we will be sharing here and on our EndNote News Twitter feed.
I hope this helps!