Download the local help from the following location and save to a local drive: www.autodesk.com/inventor-2023-help-download
When you install the deployment, the Local Help is installed to: %ProgramData%\Autodesk\Inventor 20xx.
To change the default behavior: After you install the local help, you can switch between accessing the local Help and online Help any time. Control the default behavior using the Help Options in the Application Options dialog box - General tab.