This method permits to download one or several files from the reference material.
If you specify folders or multiple files, the method will zip all of these and send a zip.
The connection token
The path/name of the file or files to download.
To download multiple files, separate the file names/paths by ":". The files will be zipped and the method returns a zip file.
If set to "true", the downloaded file will be zipped. If omitted, the file is not zipped.
Returns stream of bytes.