I've just published the latest version of SparkleXRM on NuGet to make it easier to use from within Visual Studio.
You can simply add a NuGet reference to SparkleXRM and the dependancies will be pulled in as well.
PM> Install-Package SparkleXRM
Once installed, the Sparkle XRM assemblies will be referenced in your project and the latest managed solution can be found in the '\packages\SparkleXRM.7.2.3\content' folder.
Currently there is the CRM2015 version 7.2.3 available but I'll add the 2011/2013 version as well shortly.