You can download the latest version for more clarification. If you are using Team Viewer on the phone (https://play.google.com/store/streaming sites/developer?id=TeamViewer&hl=en_US) then try & reinstall it. For PC version download the entire paid package from the official website.
Hello @piper76 ,
thank you for your post. Welcome to the Community!
Could you please tell me which operating system do you use?Please check also this article: Which operating systems are supported?
Thanks in advance for your feedback
Best, Alena