Stats Counter was working, but now I'm not seeing any data.

Stats Counter was working, but now I'm not seeing any data. I thought that my membership gave me access to this, but I've gotten some indication that I have to pay for this plug-in, and that what was working was just the free/trial version. If I have to pay, then I'm really not interested and could use some advice for a similar free stat plug-in.
Thanks,
Keith