Revit API download librarys

import clr
import System
#Import dynamo geometry design script
clr.AddReference('ProtoGeometry')
from Autodesk.DesignScript.Geometry import *
#Import ILIST method
from System.Collections.Generic import *
# Import ToDSType(bool) extension method
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.Elements)
# Import ToProtoType, ToRevitType geometry conversion extension methods
clr.AddReference("RevitNodes")
import Revit
clr.ImportExtensions(Revit.GeometryConversion)
# Import RevitAPI
clr.AddReference("RevitAPI")
import Autodesk
# Import DocumentManager and TransactionManager
clr.AddReference("RevitServices")
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
#Import revit classes data base
clr.AddReference('RevitAPI')
from Autodesk.Revit.DB import *
#Import math nodes
import math
# doc, app, uiapp
doc = DocumentManager.Instance.CurrentDBDocument
uiapp = DocumentManager.Instance.CurrentUIApplication
app = uiapp.Application
doccreation = doc.Create
data = IN[0]