AdaptiveLINQ is packaged as a Visual Studio Extension (VSIX). It works with Visual Studio 2012, 2013 and 2015.
You can use AdaptiveLINQ to build project for .Net framework 4.0 or later.
Using Visual Studio, menu Tools\Extensions, search and download AdaptiveLINQ.
You can download AdaptiveLINQ from Visual Studio Gallery too, and execute the .vsix file.
Follow the VSIX installation process and it's ready!
You can check that AdaptiveLINQ is really installed in the Visual Studio About dialog.
As long as you don't register a license, AdaptiveLINQ will work in the limited free edition.
Read more about the free edition limitation here.