There is a fixed crack to S.T.A.L.K.E.R: Clear Sky russian version.
If you running game for first time or ever
If you run game after three days and you see error message with this text:
Unable to launch the application without a disc in the drive due to incorrect system time
settings. Make sure the time settings of your system are correct and restart the application.
If the error recurs, insert the licensed disc of the application in a disc drive and run it
again. To obtain an error report and send it to product technical support, press the
The application period of validity without a disc in the drive has been exceeded. Insert the licensed disc of the application in a disc drive and run it again.
If the error recurs, press "Error report" and send the report to product technical support.
Use this crack to solve that problems. But before anything, read the NFO file!