The EPS is just a mashup of bitmaps.
Author response
HI Karen_Parkinson. Thanks for the feedback. The file you purchased is an Adobe Photoshop file and should be opened and edited with Adobe Photoshop CS4 or higher.
If you do not own Adobe Photoshop, you can download a trial version or purchase it here: http://tinyurl.com/n4stbhf
NOTE: Within Photoshop, each vector smart object can be opened and edited via Adobe Illustrator by double clicking the Smart Object icon.