To get it to work, you just need to download it from nuget and use approperiate namespace:
using PowerfulExtensions;
using PowerfulExtensions.Linq;
... etc


Linq

Foreach
Union based on fields/properties
Distinct based on fields/properties
Intersect based on fields/properties
Except based on fields/properties

Class members

Get field/property name

Attributes

Get class attribute
Get field/property attribte