Nancy Drew and Trail of a Twister...Registration Code?

I rented Nancy Drew and Trail of the Twister from the library today, but I can't load it on my computer without the registration code and it is nowhere to be found on the case from the library and there wasn't a manual or anything. I've tried googling and everything but I don't know what else I can do...does anyone know what to do or have the registration code? Any help would be appreciated, thanks!