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Put the .cfg file into your cstrike directory. While in the game, bring up the console with ~ and enter exec filename.cfg (substitute filename with the actual file name). To have it load automatically, add the line exec filename.cfg to your autoexec.cfg.

Place the CFG file in the cstrike directory. For a localized version, also check cstrike_russian, as files there take precedence. Avoid putting it in cstrike/maps or other subfolders.

Type exec filename.cfg in the console to load it for the current session. For permanent use, add exec filename.cfg to autoexec.cfg or userconfig.cfg. Do not replace config.cfg directly, as the game might overwrite it on exit.

Remove the CFG file from cstrike and restore your previous config.cfg from a backup. If you don't have a backup, delete config.cfg and autoexec.cfg; the game will create new default files on next launch. Check the CFG for commands that your game build does not support.

Delete or rename config.cfg and autoexec.cfg in the cstrike folder. Launch the game, and it will generate fresh default configuration files. You can also remove any exec lines you added to autoexec.cfg.

Most settings like rate, cl_updaterate, and sensitivity are client-side and work on online servers. However, some servers may enforce their own values or kick for extreme settings. If the CFG includes custom models or sounds, those may be blocked by consistency checks.