Thank you for your message.
If you have customers, then you are not a private user. This means you are a professional user that owns a license. This is good news! As licensed users can use previous versions and you are not forced to update. ;-)
Regarding the private users: we didn't implement this just to annoy the user.
The main reason why we force updates is because of security reasons. We want to guarantee the safest and most performant product for our users.
Please note that you can also enable auto-update for TeamViewer
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