I am afraid that we do not provide Silverlight 4 assemblies since the Q3 2012 release. In order to use UI for Silverlight, the project should be built against Silverlight 5. We highly recommend our clients to migrate to the latest version of Silverlight so that they are up-to-date with our latest development strategies, bug fixes, new controls and features. That being said, we have backdated your trial so that you now have access to those assemblies.
We're sorry for any inconvenience caused.