Requirements

This guide requires OSDBuilder 19.4.11 or newer

Select a Windows Base Language

In this guide, I am going to add 5 different languages to Windows 10 1809, so I need to pick a Base Language to start with. I will refer to the following Microsoft link to make that decision

I'm in luck that there are no requirements on the Base Language. This means that any language can be used as the Base Language. I'll take the easy road and use English (US) as my Base Language

You should download all your Volume License Media from MVLS. In this guide, I will be using OSDBuilder to download the Feature Updates and extract the OS from there. You will need the Windows ISO's for each Language you want combine (i.e. 5 Languages = 5 ISO's) unless there isn't one

If you already have your ISO's, you can skip this step, otherwise you can use the following command to download Volume Licensing Media for Windows 10 1809 x64

Get-DownOSDBuilder -MediaESD Download

Keep in mind that this may take a considerable amount of time as the files must be downloaded and extracted

Download the Windows 10 1809 Language AND Features on Demand x64 ISO

If you are unable to download either of these ISO's, the remainder of this guide will not work. You will need to create separate Windows 10 Language Images

ISO Extract the FOD and Language

If you are unable to extract either of these ISO's, the remainder of this guide will not work. You will need to create separate Windows 10 Language Images

Extract the following ISOs from as shown in the image below

  • Windows 10 1809 Features on Demand x64

  • Windows 10 1809 Language

In the Windows 10 1809 Language content, delete the directories and files for the Languages that will not be in your Media. Do not delete your Primary OSMedia Language files

Windows ADK

Download and install the Windows ADK and the WinPE Addon

Add the Windows ADK to the proper Content directory

If you have the Languages ISO in your ISOExtract directory, delete ALL the ADK Language sub-directories from the following location

<OSDBuilder Home>\Content\ADK\Windows 10 1809\Windows Preinstallation Environment\amd64\WinPE_OCs

Why delete them? Ask Microsoft ...

https://docs.microsoft.com/en-us/windows-hardware/manufacture/desktop/add-language-packs-to-windows#get-language-resources-language-pack-iso-and-feature-on-demand-iso