Hi...
The Bonus pack contains the following items:
8 G2+ Character
6 Head for G2+ Character
112 Human Basic Motion for G3 Character
23 PartHead for G1 Character
167 Props
11 Scene
You can easily check if the content has been installed correctly by going to Content Manager > Actor tab > Character > G2+. If you have the 8 bonus G2+ characters listed then the pack is installed.