Installed TeamViewer v14.3.4730 on Windows 10 Windows Version 1903 (OS Build 18362.175) and Purchased Licence 13/06/2019
Problems
1. Copy/Paste didn't work ,
2. File Transfer wouldn't open and
3. Couldn't close remote session using X button )
I had to revert back to v13.2.36215 which fixed problems