The EF6 nuget has been published. It is available here and can be installed using Install-Package MiniProfiler.EF6 -Pre
In order to use it you will need to also install MiniProfiler v3 (your question references the old repository).
To initialize, simply call the following in your application startup logic:
using StackExchange.Profiling.EntityFramework6;
...
protected void Application_Start()
{
MiniProfilerEF6.Initialize();
}
Be sure to call this before using EF in any way.