i am logged the game with my blizzard account. the game dont show me how start
You need to be logged into your Blizzard Account that is linked to your Blackops 4 game with the Desktop App https://www.blizzard.com/en-us/apps/battle.net/desktop once there click on the Blackops 4 icon. You'll first need to download Blackops 4, don't click "Play" until the download is 100% completed.
You can verify your purchases https://account.blizzard.com/transactions
Once completely downloaded click on the "Play" button.
Make sure your PC meets the Recommended Specifications https://us.battle.net/support/en/article/161495