Here's a gif on how to connect to your license server. You'll have to find the server name where the red license dongle for the Worx Plugins is located.  

Gif here Gif steps
  1. Type in localhost:1947 in your browser
  2. Go to configuration
  3. Go to the access remote license managers tab
  4. Click aggressive search
  5. Type in Worx license server
  6. Click submit
Then relaunch AutoCAD and try to launch the plugins.