Sadly Computer Music Ltd is winding up operations
and will no longer be supplying or supporting Sibelius products.
You can get AVID sibelius support here and here.
You can also contact the team at Music Education Network (Music EdNet)  the best email is
Phone number is 0800 141 474
Support is  The Music EdNet team really know their stuff so you will be in safe hands.  Here is a link to their website Music Education Network
For  PD and training and set up advice you can also contact Martin Emo