Hi and welcome to the forum
DVD Shrink is not updated by a long time, and its decrypting capabilities are rather limited for recently released DVDs. I don't know DVD43 software, but probably it is not updated often too, so you need a more recent decrypting solution.
At the moment there are two solutions:
DVDFab Decrypter (free) and AnyDVD (not free).
Both are regularly updated