Dear Katharina, I have just fallen the same situation. I am using this great software Teamviewer to help my Family. But today when I upgraded TV11 to TV12 remotely, a message warning was displayed that I am in a sponsored session and it will last 5 minutes. Is it probable the upgrade silently to migrate this installation to some trial or commercial use. I looked at About window and the license is free! What is my next step if I wish to continue to use free version without these annoying message windows? Best regards!
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