Problems with MELODIC fsl

I have a resting-state fMRI dataset that I wanna use to retrieve the resting state networks. This is the dataset and the corresponding paper:

https://openneuro.org/datasets/ds002766/versions/3.0.0
https://www.sciencedirect.com/science/article/pii/S0896627320303536

And these are the preprocessing steps:

Now, when trying to compute MELODIC on fsl, I disable all preprocessing steps including registration (which I do not now if it must be done) and the MELODIC analysis either gives me errors or goes on without finishing.