Mobile Edition 1.4 does nothing

Hi there,

I just purchased the mobile edition addon.
Followed the instructions; uploaded the folder mobile to the root of whmcs.
Updated the license from within WMHCS; it says I have the Mobile Edition Addon.

But when I go the the url mydomain/whmcs/mobile nothing happens; blank. It's not an error saying the page is not found but just nothing happens.

What am I doing wrong ?

Kind regards,
Matt