Rosetta Stone is a great tool for learning a new language. However, if you want to use the tool with a language that is not included in the Rosetta Stone app, you will need to install a language pack. There are many different language packs available for Rosetta Stone. You can find them on the Rosetta Stone website or on the app store. The best way to find which pack is right for you is to use the search bar on the Rosetta Stone website or app. Once you have downloaded and installed the appropriate language pack, your Rosetta Stone experience will be much improved.