I'm running Windows 10. I'm supporting a machine running MacOS 10.10.5.
Thank you!
I just spoke to a rep from TeamViewer who told me that v13 will work on MacOS 10.10.5 (Yosemite) and Windows 10.
You can get it here: https://www.teamviewer.com/en-us/download/previous-versions/
That does not work. Got installed v13 on both machines and getting error about not maching versions.