I personally prefer using NuGet along with EnterpriseLibrary.config. When using this setup you only see application blocks that are available based on the installed packages and the project type (profile). See Entering
Configuration Information in the Autoscaling documentation.
But to enable Autoscaling to appear in the configuration tool you should just have to copy these assemblies to the C:\Program Files (x86)\Microsoft Enterprise Library 5.0\Bin directory (or wherever Enterprise Library is installed):
And then ensure that the configuration tool is running from that directory.
Enterprise Library support engineer