FFXIV needs a better file validator

So, I've been taking both of my friends through the game (they're in HW right now) and they don't live in a place that has the most stable of internet and when they download the game, the connection some times drops during download and they have incomplete files that cause their games to crash.

The file updater just downloads the whole game and not you know, the file that is incomplete and/or corrupted and it's not great because it doesn't solve the problem.

Is it possible to rework it to where it only redownloads the parts where it failed to validate?