I’ve accessed the PDBP transcriptomics data through AMP PD but not directly from PDBP. This might be an easier route. You can always subset to PDBP and either use the clinical data from PDBP or the harmonized data from AMP PD.
What data type are you looking to get? The raw fastq files? Or something like count data? @vdardov has a nice post about accessing AMP PD data and an introduction to the Terra platform. If you are looking for a smaller file like count data, you can also download it (smaller egress fees that way) and work with it from there.