Hello! I encountered a problem connecting the client to games and chat. After a long wait, a sign with a problem appears. (listed in the appendix). I ask you to help me solve this problem, because I cannot enter any lobby and cannot select a game mode.

The problem you are having is not related to Voobly. You appear to have connection related or simple DNS issues.

Try Start > type "cmd" > right-click "run as administrator" > click Command Prompt:
ipconfig /flushdns
ipconfig /registerdns

If the problem persists, try a clean installation of the Voobly client:
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