Session times out even though both systems are running the latest version of TM available.

This is a question in response to the posting "Older Version of Mac OS" dated Jan 3.

I am using TeamViewer to assist my former neighbor manage her older computer, which can run no later than macOS Catalina 10.15 and TV 15.10. I am running Sonoma 14.5 on my machine with TV 15.54.6. We have been plagued by session time outs and I have discovered this posting which enables me to update TV to the latest possible for her machine. To test this, I used one of my machines running the same OS and TV as hers. I updated TV to 15.45.3 using the info above in your post. However, the sessions I ran to test this continue to time out after the "latest" TV install and reboot. This is contrary to the posting from April 9 titled "New updates regarding the free usage of TeamViewer 15" which indicates that macOS after 10.13 would still be supported for free use, that is, able to be used even though updates to TV are no longer supported for 10.15. How can we use this without getting kicked out every few minutes? Have you decided to oblige us to pay for the service at this point, even though your listings and posts seem to indicate otherwise? Thank you for your attention.