You need to add the presets into the browser in Carrara.
To do this, go to the browser.
Then select the 'Object' tab.
Then click the black button in the upper corner of the browser.
In the menu, choose 'Add Folder.'
Browse to this content add-on.
…Presets\Hair\4 Ladies Only
Then you can add the .car files and they should show up as presets in the folder.
Then drag the preset (hair) from the folder and drop it on the word 'head' in the instance tab.
The procedure for using the shader presets (.cbr) is similar.