Click on the template_11th_12th_v4 link to download to your Desktop.
Select the Open with (Microsoft OneNote default) button. Click OK
A dialog box named Unpack Notebook will appear.
Name: Your Unit/Lessons Notebook - ex. History HL Unit1 - Click the Create button - (note - the path will by default save the newly named Notebook to your OneNote Notebooks folder)
The package template will unpack and open in OneNote.
Now, back on your computer desktop, the Downloads folder is still open. Drag the template_11th_12th_v4 package to the desktop.
The Package will open on you desktop. Drag the folder to the desktop
Finally, in your My Documents folder, open the OneNote Notebooks folder and drag and drop the template_11th_12th_v4 package into that folder. This file is ready to unpack at anytime to create a new unit/lesson notebook that you will rename with a unique title.