Hello @JoSta95,
Code for reproducing the analyses presented in our manuscript (including how to read the data and cluster calls into R) are included on our GitHub repo. Another option would be to download the data and meta-data directly from our website, where we have gene expression aggregated per cluster, calculated as trimmed means. A final option is to use our RNA-seq Data Navigator, which has much more flexibility in its features and will allow download of many different types of data aggregations for up to 10 genes at once.
I would strongly discourage you from trying to regenerate the cluster results from scratch unless your purpose is to compare different clustering results.
Best,
Jeremy