How to use the free version after the paid

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Hello, I used the free version of Teamviewer from a long time to help my family because I'm at 1000km of them. The last year, I had to work for a new service online to repair pc. As they had a Teamviewer license for hotliner, I used it. But this project falled in the water and it seems they have not renew the license. Thus I can not use Teamviewer for my family. How can I return to the free version please ? Thanks a lot and happy new year for everybody !!