Office 2021 Proofing Tools Offline Installer May 2026

Microsoft publishes individual language pack CAB files on the Microsoft Update Catalog.

Assumption: You have rights to download Office 2021 installation files (retail or volume) and can access Microsoft download sources from a connected admin workstation.

Run:

Copy the SourcePath folder to your offline distribution server, network share, or USB media.

On each offline target, run:

Notes:

Copy the Office folder and setup.exe to the target computer.

You cannot just double-click the .exe or .img file. To install silently via the offline tool, you use the Office Deployment Tool (ODT) with a specific configuration.xml file. office 2021 proofing tools offline installer

Sample configuration.xml for offline proofing:

<Configuration>
  <Add SourcePath="D:\" OfficeClientEdition="64">
    <Product ID="ProofingTools">
      <Language ID="en-us" />
      <Language ID="fr-fr" />
      <Language ID="de-de" />
    </Product>
  </Add>
</Configuration>

Run: setup.exe /configure configuration.xml Microsoft publishes individual language pack CAB files on

Microsoft has moved heavily toward Click-to-Run (C2R) streaming installations. When you try to add a proofing language via File > Options > Language, Office usually tries to reach out to the Microsoft CDN (Content Delivery Network) to download a few MB of language data.

This fails in three common scenarios:

Cause: Corrupted MSI cache or missing network path. Fix: Copy the installer to the local C:\Temp folder and run from there, not directly from a network drive.

Yes. Office LTSC 2021 (Long Term Servicing Channel) uses the same codebase as retail Office 2021. The same offline installers work perfectly. Copy the SourcePath folder to your offline distribution