That library has been replaced by the eXpressApp Framework which you will need to buy instead (or there is a free trial).
But you have been told this already -
How do i...how can find download devexpress.xpf.layoutcontrol.v11.1.dll[
^]
There is no alternative - as the message says
Quote:
Silverlight project will only work with Silverlight assemblies
If you have any further issues with DevExpress components then the right thing to do is contact them as the supplier