When The client version 11 was implemented both Tibia 10 and Tibia Flash client were discontinued.
From wiki:
On October 25, 2017, it was announced that it would no longer be possible to log in any game world using the Flash Client starting the next day. i.e. Octoboer 26, 2017. This marked the official end of this client, 9 years after its first announcement and 6,5 years after the release of its first beta-version.
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