- Disable internet, start installer depending on your system architecture.

- During setup use the key below:

CK99B-X8F9S-6VZP7-YQJKA-16YDX-CB15

- Proceed, close activation dialog aat the end of install. Don't try to activate it yet.

- Open CB-Keygen.exe. Choose ChessBase 15 on the list. Click New serial. Seclect Engine: None.

- Choose Built-in Activation. Click Activate button.

- Now you will get activation pop up on your screen. Close it. Click OK button on your screen. You will see Activation is successful on keygen. Close keygen now.

- Block ChessBase 15 in your firewall or disable internet. Click No thanks to account create question at launch.

- Re-launch ChessBase and all done :) Do not go online with it, keep it firewalled and all good.

- Install Service Pack 7 update to version 15.7 now.