As your suggestion, I let my browser enable the FTP URLs.
Then, I open the chrome and paste the URL (s3://fcp-indi/data/Projects/ABIDE2/Outpu...).
But still it does not work.

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This XML file does not appear to have any style information associated with it. The document tree is shown below.

NoSuchBucket
The specified bucket does not exist
Outputs
NC9JKX9Q1137KGMS
pm/2ivUS5ShhvVxGF0PhnVHyI923IDcEUT/A5BH0M4hiw354T4h9oH8WFTNf4dPDXBkyqZILzeY=
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This is the error on my screen.
Could you tell me how did you open the link and filter the data?
I would like to download specific data (such as ABCxxx.nii.gz) among various preprocessed data.