How to update your Lightroom 4 catalog with XMPs:
Once your order has been completed, you will receive a zip file with your XMPs.
Double click to unzip this file and copy the XMPs into the same folder as your original Raw files.
In the Lightroom Library Module, highlight all images. (CMD/CTL+A)
Choose the menu item Metadata>Read Metadata from files.
Now Lightroom will spend a little time updating the previews with our work. Watch the thumbnails update and enjoy!