Google Tour Builder includes two options for moving your projects from Tour Builder into the web versions and desktop versions of Google Earth.
The simplest way to move your projects from Tour Builder into the web version of Google Earth is to just select "Export to Earth" from the menu in the upper-right corner of the screen when you're viewing one of your Tour Builder projects. You'll then be asked to confirm that you want to connect your Tour Builder and Google Earth accounts. After that you'll get an email to notify you that your Tour Builder project is now viewable in Google Earth under "projects."
The other option for moving your Tour Builder projects into Google Earth is to select the download option in the upper-right menu when viewing a Tour Builder project. You can then download your project as a KML file that you can then manually upload to the web version of Google Earth and or manually import into the desktop version of Google Earth.
Both methods for moving projects from Tour Builder into both versions of Google Earth are demonstrated in this short video.