1. install the purchased DAZ figure into a folder on your desk top. Give that folder a name like "My DAZ runtimes".
2. from within C6 go to the browser (ctrl B) and click on the content tab.
3. in the far upper right corner of the browser is the file/folder menu for managing content folders. Open that menu and select "add runtime", adding the new runtime folder.

Your new runtime folder should now appear in the left hand browser list. Select it and you should find your content waiting for you.

You can add more content to the runtime folder anytime and C6 will see it when you next open it.
Try this, then post back if it doesn't appear.
note: until you know why the files are placed where they are, DO NOT REARRANGE the folders within your runtime.