The thing is i don't know where the " library/ directory in your XenForo installation " is cause my developer did it all untill now and i don't want to work with developers anymore cause i wana learn my self XD
If an add on it is not working, then it can be because of several reasons. E.g. did you configure the permissions and settings correctly? If you did that and it does not work still, then the add on might not be compatible with your forum version. In any case the best thing to do in such case is to post at that add on's support topic.