regrettably, versions 5.x are not supported anymore since Kentico 8 has been released.
For more details please read this article from CEO of Kentico:
Announcing End of Support of pre-5.0 Versions
But I would recommend you to:
- Check the Event log if there are any errors
- Mare sure that the disk permissions are set correctly as it's described in the Dev Guide:
"Please note that the Web Analytics module requires that the Modify permission for the ~/app_data folder on your disk is granted to the ASP.NET account"