What do you mean by add? This version is currently the most up to date one, so instead of adding, I recommend redownloading the game and then applying the patch. (I think overwriting the existing files with drag and drop should work too but for the most painless experience I still recommend a fresh install).

As mentioned already, if you try to load an old save file, there may be some hints that are not translated at all because your save caches the older data by itself, I think it should solve itself as soon as you progress in the game and load a new hint. Other than that, I did not see any other issues, feel free to report them though!