Their new repository is now on github: <https://github.com/mg5amcnlo/mg5amcnlo>. We should use the [3.4.1 branch](https://github.com/mg5amcnlo/mg5amcnlo/tree/3.4.1), which includes the [bias reweighting patch](https://github.com/mg5amcnlo/mg5amcnlo/commit/c586517c58169d220314280dc6aa1ab6decb9c37) that might be needed in the future.
Their new repository is now on github: https://github.com/mg5amcnlo/mg5amcnlo. We should use the 3.4.1 branch, which includes the bias reweighting patch that might be needed in the future.