@anle01637: The key didn't change for latest beta version, as well as compatibility with specific build. I can only suggest to view some tutorials about basic umodel usage, starting from the recommended one from
tutorials section. Also, after in-game download is complete, make sure to open root game folder in umodel to avoid issues, because additionally downloaded packages are stored in different folder than default ones.
I've added launcher for CBT2 version to the first post, as it's not self-upgradable from the first beta, though not sure if it still works.