Direct link to Revit 2016 Update 1 for R2: http://up.autodesk.com/2016/RVT/Autodesk_Revit_2016_R2-x64_UPD1.exe
Readme: http://up.autodesk.com/2016/RVT/Autodesk_Revit_2016_R2_UPD1_Readme.htm
Release notes: http://revit.downloads.autodesk.com/download/2016RVT_R2_UPD1/Docs/RelNotes/AutodeskRevit2016-R2-UPD1ReleaseNotes.html