how to start the game again Sniper Ghost Warrior 3 (Sniper: Ghost Warrior 3)

downloaded the Russian version of Sniper Ghost Warrior 3 (nemos), walked to the end, but want to pass it one more time, tried everything nothing's helped.
Removed the game, cleaned the Windows program CCleaner, and the result is 0.Also all passed!!! HELP!!!
Advise what to do?