Thanks for the help guys. I wrote to Sega support and this worked perfectly for me:
Please try the following:
- Completely exit from the Steam client.
- Go to C:\Program Files\Steam (or the Steam directory that was specified during installation).
- Locate ClientRegistry.blob and rename this file to ClientRegistryOld.blob.
- Restart Steam to allow the file to be recreated.
Once that's done, start steam again and reverify your game cache as shown here:
1. Load Steam
2. From the Library section, right-click on the game and select Properties from the menu.
3. Select the Local files tab and click the ‘VERIFY INTEGRITY OF GAMECACHE…’ button.
4. Steam will verify the game's files - this process may take several minutes.
5. Once the process is completed, the Check Window will automatically exit.
6. We recommend verifying your cache twice to make sure all files are fully downloaded
Now everything is wokring again =).