For a deeper look into our DataScope Select REST API, look into:
Overview | Quickstart | Documentation | Downloads | Tutorials
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You can refer to the /Extractions/ExtractedFiles endpoint on the DSS REST API Reference Tree which can be used to retrieve a list of files and download files.
Get a list of files
Download a file by an extracted file ID (ExtractedFileId)
Otherwise, if you would like to download extracted files from schedule extractions, please refer to this DSS REST API: Downloading Completed Extraction Files by a Schedule Name article.
I hope that this information is of help.