I have been working on data on matrices containing TCGA samples with their gene counts according to each gene (rows= gene ids, columns=sample IDs). I have been using TCGAbiolinks package on R to download the data and apply differential expression analysis pipelines on it. I am trying to get GTEx data but it does not seem to be so obvious to get data in the same format (columns=GTEx samples IDs, rows=gene IDs). Can anyone suggest a way to get data in the same way so I can run some DEA pipelines? Should access be requested to dbGap to actually get hands on the data?

Thanks and I'd appreciate any kind of help :)