I get an error "pack file corrupt or tampered with "

When logging into the game on any server, both with mods and without mods, I get an error that the PAC file is damaged or forged, and it is suggested to check the integrity of the files through Steam. When checking the files, there are no damaged files, the game has already been reinstalled, and Windows has also been reinstalled. But this error keeps coming.
Please tell me what else can be done to eliminate this error.

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