i installed the client but its show a bug even before opening the client

You can bug report it here: Gaijin.net // Issues (just search a bit first so that you donβt report something that is already reported and known about)
A guide on how to report bugs can be found here: ([Navigation] Technical Knowledge Base | War Thunder Wiki)
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Try deleting the cache folder within WT. Itβll rebuild it on start up. Might solve the issue.
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