To open the design on the computer after downloading you need a software program. The easiest one to use is Embird.(other folks may be able to suggest other programs) Be sure to make a back up of all your design downloads as both a USB stick and computer hard drive can crash, best to save copy to a CD. Most designs are sent zipped, so a program to unzip is also needed - there is a free one online - google search will show up many. I also save all my purchased designs in a folder called (get this) Purchased Embroidery and free designs (now guess the name) Free designs. Unzip and then save to USB and copy to CD's.
Good luck and enjoy your machine.