I received a message at AUGI last night from a member trying to find the help documentation for 2010 (in .chm format). I thought I'd post a more general response here too.
When you install Revit the Help documentation is supposed to be installed in this location:
C:\Program Files\Autodesk Revit Architecture 2010\Program
C:\Program Files (x86)\Autodesk Revit Architecture 2010\Program (32 bit Revit on 64 bit OS, prior to 2010 version)
I don't think they've posted either of these RAC files at the Revit sites at Autodesk.
Other Help Files (PDF) at Autodesk
Revit Architecture 2010 (English version is a 32 mb pdf)
Revit Structure 2010 (English version is a 28 mb pdf)
Revit MEP 2010 (English version is a 32 mb pdf)
Online Revit Architecture 2010 Help Doc
Online Revit Structure 2010 Help Doc
Online Revit MEP 2010 Help Doc
Where is my Command - Revit Architecture 2010
I hope this holiday finds you with much to be thankful for! If this holiday isn't "yours"...there are always good reasons to be thankful, may you have plenty of them! I can think of one starting with R... *-)