I might be missing some step, but I just datalad install-ed this repo and tried to datalad installl / get 1 subject. I couldn't get very far.. as I am seeing these error messages.
brlife@wrangler:/mnt/datalad/human-connectome-project-openaccess$ datalad get -r HCP1200
[INFO ] Installing <Dataset path=/mnt/datalad/human-connectome-project-openaccess> underneath /mnt/datalad/human-connectome-project-openaccess/HCP1200 recursively
[ERROR ] Failed to clone from all attempted sources: ['https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100206', 'https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100206/.git', 'ria+http://store.datalad.org#346a3ae0-2c2e-11ea-a27d-002590496000'] [install(/mnt/datalad/human-connectome-project-openaccess/HCP1200/100206)]
install(error): /mnt/datalad/human-connectome-project-openaccess/HCP1200/100206 (dataset) [Failed to clone from all attempted sources: ['https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100206', 'https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100206/.git', 'ria+http://store.datalad.org#346a3ae0-2c2e-11ea-a27d-002590496000']]
[ERROR ] Failed to clone from all attempted sources: ['https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100307', 'https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100307/.git', 'ria+http://store.datalad.org#a51b84fc-2c2d-11ea-9359-0025904abcb0'] [install(/mnt/datalad/human-connectome-project-openaccess/HCP1200/100307)]
install(error): /mnt/datalad/human-connectome-project-openaccess/HCP1200/100307 (dataset) [Failed to clone from all attempted sources: ['https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100307', 'https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100307/.git', 'ria+http://store.datalad.org#a51b84fc-2c2d-11ea-9359-0025904abcb0']]
[ERROR ] Failed to clone from all attempted sources: ['https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100408', 'https://github.com/datalad-datasets/human-connectome-project-openaccess.git/HCP1200/100408/.git', 'ria+http://store.datalad.org#d3fa72e4-2c2b-11ea-948f-0025904abcb0'] [install(/mnt/datalad/human-connectome-project-openaccess/HCP1200/100408)]
...