All 74 languages are on the device once connected to the internet! There is no need to download individual language files at all.
You might find more than the 74 languages in your device but we don't count the extras as one of our supported language. This is because we count a supported language as a language that has the ability for voice input into Pocketalk.
For example, although Samoan is listed as a language in device (for translated text output only), we do not count this as one of our 74 supported languages because Pocketalk does not support Samoan language voice input.
You can find the full language list here.