I'm going to take a chance and assume you are using calibre on a Windows/OSX/Linux computer and Calibre Companion on your Asus ZenPad (an Android device, as far as I know, so no calibre).
Are your computer and the ZenPad on the same network? Can you connect to the calibre content server on your computer using a browser on the computer itself using the IP address and port shown when you start the content server? If so, can you connect to the content server using Chrome/whatever browser on your ZenPad?
Since you mentioned CC Demo, I seem to remember the demo version of CC only allows 20 books on your device.
Depending on the results of your tests, you might consider taking this discussion to the Calibre Companion thread.
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