Here are the basic steps:

  1. Download Office Deployment Tool
  2. Modify the configuration xml to include Updates Enabled TRUE and Current Branch info, as well as Display Level Full. Looks something like this for 32bit ProPlus (but I forget the DisplayLevel setting below):
  3. Run the setup command to download, like this
  4. After, download of Office 2016 has completed, run the installation command to install:
    setup.exe /configure c:Officeconfiguration.xml

Got this from Jetze’s blog:
to upgrade Office 365 ProPlus on a single computer to, just follow this procedure.

  1. Download the Office Deployment Tool and extract the files to a temporary location, for instance C:Office.
  2. Make a backup of the configuration.xml file and edit the contents to something similar to this:

    Note that the value for Branch is set to Current. Other valid values are Business or Validation (First Release).

  3. Execute .setup.exe /download c:Officeconfiguration.xml to download the Office files to your local computer, this may take a while.
  4. Next start the installation with .setup.exe /configure c:Officeconfiguration.xml

During the installation of Office you will be prompted to save your work and close any opened Office programs.

Jetze’s blog: Office 2016 update branches and how to force an upgrade for Office 365 ProPlus