Waver Xtreme Plus 0.15 was an alpha test version released quite a while ago. That test version did not have the licensing in it, nor automatic updates.
If you are really still running under version 0.15, you will have to do a manual upgrade to the current version. And there may be some of the settings that have changed as 0.15 was a very early version. The easiest way would be to deactivate and delete your old Weaver Xtreme Plus, and then simply install the latest 1.2 version.