Also more more line already in advance , that sometime client's already have new version on their PC/Mac then they see below mentioned screen
And then they cannot put TV ID and password or might need an account to log in.
So they must "switch back" to older interface by turning-off this button (marked in red)
When they disable it , it will ask to restart the TeamViewer. Then simply click on restart button
And then they will get older interface
