Hi @László Megyeri
Thanks for your detailed case description. We fully understand your situation and feelings.
However, according to the official file, we regret to inform you that your system is not supported by the new Teams. You can continue to use Teams until the update, but it is still recommended that you update to a system supported by the new Teams. Please accept our sincere apologies for the inconvenience caused to you.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.