Hi Steffen,
The projects published on the B&R GitHub are not officially supported by B&R, even if they are created by B&R employees. This page is just a way to share helpful projects or sample code. Unless you hear differently, it’s safest to assume that this library will not be updated beyond what exists currently. That being said, perhaps one of the developers sees this post and can correct me!
You are always welcome to adapt and change the sample code to your own needs, including updating it to work with AS 6. The cleanest way to do this is to fork the repository and make the required changes in your own copy. If you’d like to contribute those changes back to the main repository, you can then make a pull request. In this case, it looks like the libraries were posted to GitHub in binary format, so you wouldn’t be able to edit them. But I wanted to include this note for any other libraries you may come across in the future.