TCGA driver mutation data

I would like to download driver mutation data for TCGA patients ( in particular lung cancer but ideally 'pan cancer'.

For example I would like to be able to discover the proportions of patients with adenocarcinoma of the lung who have driver mutations in KRAS, EGFR, TP53 etc etc.

I came across this paper - 'Comprehensive Characterization of Cancer Driver Genes and Mutations' (www.ncbi.nlm.nih.gov/pmc/articles/PMC6029450/) where they produced a database of 9423 exomes annotated with various putative drivers. Does anyone know how to access their dataset? I can't seem to find any instructions.

If not, which source would you recommend to get such data from (i.e. driver mutation data), and why

Thanks in advance