If you have troubled to install Silverlight, with no results, then try the following.
Give the following command on terminal prompt:
yaourt -S wine-staging-opt
then choose version "pipelight/pipelight 1:0.2.8.2-1" (no choose versions in other repositories,
although most up to date ).
Once installed, give the following commands (answer yes to the request):
pipelight-plugin --enable silverlight5.1
pipelight-plugin --enable silverlight5.0
pipelight-plugin --disable silverlight5.1
This is all...