Trooper

Howdy, I bought the Champions Powers Character Pack and I can't load/install it because there is no file extension. I have perused the HD documentation and not found anything enlightening. Has anyone else experienced this? How did you solve the problem? I'm not a computer wiz, but I can follow directions. The problem is that I can't seem to find any directions on how to run this product. Thanks for your time. Cheers, Brian