Found version 12.0.90924 to install on the Mac and version 12.0.90922 to install on the Windows 10 laptop. Both work fine for me now. Happy bunny.
Me To: Tried to fresh install TV13 latest on Mac High Sierra: Process: TeamViewer  Path: /Applications/TeamViewer.app/Contents/MacOS/TeamViewer Identifier: com.teamviewer.TeamViewer Version: 13.1.2559 (1) Code Type: X86-64 (Native) Parent Process: ???  Responsible: TeamViewer  User ID: 501 Date/Time:…