By using the , you ensure you have the most up-to-date and robust version of the Office 2021 proofing tools, tailored for an offline environment. Let me know: Which specific languages do you need to add?

The installation will run silently in the background. Within a few moments, the new language proofing engines will be integrated into your Office 2021 applications. Verifying the Installation in Office 2021

Open Notepad or any text editor, paste the XML code below, and save the file as download-proofing.xml inside your C:\Office2021Offline directory:

If the language is set to preferred, Word will automatically toggle its spell-checker and grammar rules whenever text in that language is detected or manually selected via the status bar. Troubleshooting Common Errors

Once the download is complete, copy the entire C:\Office2021 folder to a USB drive or network share. To install it on any target machine offline:

: Use the Office Customization Tool to select "Office LTSC 2021" and then pick only the Additional Languages you need. This will bundle the proofing tools for those languages.

Finding a direct, official "offline installer" specifically for Proofing Tools is surprisingly difficult. Microsoft does not provide a standalone .exe download link for these tools on their website; they force you to use a manual workaround.

Using an offline installer ensures that you can inject required languages into Office 2021 at any time, completely independent of Microsoft’s servers. Understanding the Office Deployment Tool (ODT)

Best Practices for Offline Installation: Checking Office version, choosing correct architecture (32-bit vs. 64-bit), selecting language, and using ODT for customization.

Ensure you are downloading the proofing tools for the exact language you need, including the specific regional variant (e.g., English (United States) vs. English (United Kingdom)). Downloading the wrong variant will not resolve the error.

The table below compares the different methods for obtaining Office 2021 proofing tools:

While Microsoft 365 streams these tools online, still allows offline installation. However, finding the correct and best offline installer is notoriously difficult. Here is how to do it right.

Find your Office 2021 purchase under the tab.

In short, these tools are not just error-finders; they are intelligent assistants that help improve the quality and professionalism of your work. For most users, the default language proofing is sufficient. However, when working with documents in multiple languages or when the default tools become corrupted or missing, you will need to specifically download and install these resources.