In this video Lauren demonstrates how to download a pattern and add it to your iQ. How a digital pattern downloads to your computer may be slightly different to Lauren's, but the steps of unzipping the pattern folder from the designer, finding the .iqp pattern and moving it into the patterns folder on your iQ thumb drive are relevant and necessary.
Just a tip, once you have loaded a pattern, you can delete it from the thumb drive, but keep a copy on your home computer. It's also a good idea to immediately move the newly loaded pattern from the downloads catalog to another catalog. Lauren has a good video showing how to do that.