To download Office 2003 Service Pack 3 for Language Interface Pack, visit the Microsoft Download Center page Office 2003 Service Pack 2 for Language Interface Pack at http://www.microsoft.com/downloads/details.aspx?FamilyId=27F0C05C-4466-4114-BD5C-E7B782D6198A&displaylang=en, use the menu in the left-hand corner of the page to select your language, and follow the instructions in the “Installation Instructions” section. 

Note: this download is not available in English.