Understanding Society User Support

I received access for the dataset EGAD00010001521 through the Sanger Institute (link to the dataset: https://ega-archive.org/datasets/EGAD00010001521). This dataset constitutes DNA methylation samples from Understanding Society Study. We were planning to use it for our study as control data. However, the data is processed by a normalization method which is not suitable to my analysis. I would like to ask if it is possible to have access to the raw data (IDAT files). If possible, could you inform me about the steps I should take?