Because of limited Drive API functionality, a Google account
is required for charts which are not pre-zipped, so the
below Drive script has to create a ZIP file for the
launcher to download.
Downloading a folder converted to a ZIP as a guest or
manually downloading through Chorus Encore is a
workaround for this. As for already zipped charts,
you can download it anonymously using the launcher
directly, by using Drive's download link endpoint, as such: