I have a very small free TeamViewer account - 4 computer. My mom, my wife, and 2 old computers at home. For years I used computer 1 to take care of computers 2, 3, and 4, one of which does not even have a monitor. Suddenly this week I began to get a message only between computers 1 and 2 - "Your current TeamViewer plan does not include connections to customized TeamViewer modules." I never had this before and can't think of anything that happened other than routine windows updates. I do not get this message if I connect from 1 to 3 or 4 only from 1 to 2 (and also if I connect from 2 to 1).
I found a help article that said to reinstall TeamViewer with default options and change nothing. I did this twice and it did not stop. Then I uninstalled and then deleted all directories in program files, program data, and appData that were related to TeamViewer, plus deleted all registry keys that included the phrase TeamViewer. Then I reinstalled again with defaults only and still I have the same message.
I am at a loss for what else to try. If anyone has encountered this and found a way to fix it, please let me know - thank you!