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It is essential that no Office programs (Word, Excel, PowerPoint, Outlook) are running during the installation to prevent conflicts.
In the past, Microsoft offered direct downloads for "Language Interface Packs" (LIPs) that were easy .exe files. For Office 2021 (and Office 365), the system has changed. office 2021 proofing tools offline installer
On a computer with internet access, follow these steps to fetch the proofing tool data: Deploy Office Long Term Service Channel (LTSC) 2021
Check the Windows Event Viewer under “Application” logs for any error entries from the installation process. Also, temporarily disable any antivirus software, as some security programs can interfere with proofing tools installations. However, I can suggest an alternative: It is
Once you have the offline installer file, installing the proofing tools is a straightforward process.
On the web page, look for the section titled . You will see a series of tabs. Select the tab that corresponds to your version, in this case "Office 2021, Microsoft 365 subscription" or "Office LTSC 2021" . Then, use the dropdown menu to select the language you want to install (e.g., "Greek", "French", "Arabic"). On a computer with internet access, follow these
Extract the contents to a dedicated folder on your local machine (e.g., C:\OfficeODT ).