Hi,
I apologize, I missed this post.
Just to clarify, you are unable to run BrainSuite BIDS App on HCP data because they are not in BIDS format? And so you need BIDS converters?
If so, here are some websites that lists available programs for BIDS conversion:
https://bids.neuroimaging.io/benefits
https://andysbrainbook.readthedocs.io/en/latest/OpenScience/OS/BIDS_Overview.html
If this is not the issue, could you paste the error message you are getting when you try to run the diffusion and fMRI data?
Thank you,
Yeun