You can try using the Microsoft Office Deployment Tool (ODT) to download and install the proofing tools. ODT allows you to download and install Office products, including proofing tools, using a command-line interface.

However, I can suggest an alternative:

If you're comfortable with command-line installation, you can use the following command to install the proofing tools:

Unfortunately, I couldn't find a direct download link for the Office 2021 proofing tools offline installer. Microsoft often changes its download links, and I don't want to provide an outdated or incorrect link.

The proofing tools for Office 2021 include language-specific dictionaries, thesauruses, and grammar checkers. These tools can be installed separately from the main Office installation.

setup.exe /configure proofingtools.xml Assuming you've downloaded the ODT and extracted it to a folder, create a proofingtools.xml file with the following content:

You're looking for the Office 2021 proofing tools offline installer. Here's what I found:

Please note that the above method requires some technical expertise and might not be suitable for all users.