Installing Productbook is done like any other Joomla Component.

First you download the latest version of the Component from the Download section

The you go into your administration panel en choose installers.
Choose components.

Browse to the location on your harddrive where you saved the zipped file of Productbook.
Select the file and click on "Upload File and Install"

After this, you wait until you get a Succes page.

Now its time to take the next step in setting up your own Product book.