With this module you can replace the old prestashop breadcrumb with the new Schema structure required by Google.
Please note that the last item of the breadcrumb is also linked (just like it is in prestashop 1.7)
Of course if your breadcrumb markup is modified in your theme, you'll also need to adjust the markup of this module in it's tpl file. But usually those are simple changes.
To implement this module you need to remove the old breadcrumb div and insert a new hook in your theme's breadcrumb.tpl file (details are displayed after installing the module)