Windows: If you do not already have Times Extended Roman Unicode Font installed on your computer, download it from the Bahá’i Computer & Communication Association:
click on the following link Download Times Extended Roman, and then choose “Save File” to save the file to your hard drive (note where on your hard drive you saved the file so you can find it quickly).
Double-click on the file, which has the file name tFont.exe.
In the section “Gentium 1.02 (Mac OS 9, Mac OS X),” click on the link Download Gentium_102_M.sit
After you expand the .sit file you downloaded, install the fonts as you would any other fonts. If you have an earlier version of Gentium installed, uninstall it before installing this version. In Mac OS X, copy the font files into the /Library/Fonts folder of your System disk. In Mac OS 9, drop the fonts onto your (closed) System Folder.