Warning: There are many malicious websites offering "free" offline installers. These often contain malware, keyloggers, or cracked software. Only obtain the installer from official Microsoft channels.
Prerequisites:
Step 1 – Create the offline source on an internet-connected PC
Download ODT, extract it. Create language.xml: office 2019 language pack offline installer
<Configuration>
<Add SourcePath="C:\OfficeLangSource" OfficeClientEdition="64">
<Product ID="ProPlus2019Volume">
<Language ID="es-es" /> <!-- Example: Spanish -->
</Product>
</Add>
</Configuration>
Run:
setup.exe /download language.xml
This downloads the Spanish language pack to C:\OfficeLangSource. Warning: There are many malicious websites offering "free"
Step 2 – Move the source folder to the offline PC
Copy C:\OfficeLangSource via USB drive or network share.
Step 3 – Install on the offline PC
On the target machine, run:
setup.exe /configure language.xml Step 1 – Create the offline source on
The language pack will install without any internet connection.
Once the language pack is installed (online or offline):
The entire Office interface will change — menus, dialog boxes, help content.
Proofing tools (spell check, grammar) will also become available. You can mix display language (e.g., English) with proofing language (e.g., French).