Installing Autodesk Inventor Local Help 2018
Download Help Installer (exe) and run Autodesk_Inventor_2018_Help.exe.
The Inventor Local Help installs by default to: %ProgramData%\Autodesk\Inventor 2018\Local Help\[language]\
NOTE: The Local Help will be available within Autodesk Inventor when you are working offline. When you are online, the help from the Autodesk Knowledge Network displays.
TIP: Use the Help Options settings in Application Options dialog box - General tab to control the default Help behavior. Specify whether to access the ONLINE help or the downloaded/LOCAL Help when accessing Help from within Inventor.
Attention CAD/IT Managers: How to deploy Inventor 2018 Local Help as part of a deployment
To deploy Autodesk Inventor 2018 Local Help as a part of an Inventor deployment:
When you install the deployment the Local Help is installed respective to the location where the Program Data is installed.
You can control the default Help behavior of the help in Application Options > General tab > Help options