For Adobe Acrobat Professional 7 you can download and install the language update pack from Adobe Systems Incorporated web page. The application changed its name to Acrobat XI Pro and another solution to add the Arabic language is to go at Control Panel > Add or Remove Programs > Acrobat and click on the Change button to launch the Acrobat setup dialog. Click on Modify button > View Adobe PDF, select the desired language support and install the required packs.
