FE File Tree
The fal_securedownload extension comes with a filetree plugin you can use to display your folders/files as a tree in the frondend with force-download links.
Templates
The default templates can be found like any other extbase/fluid based extension in:
fal_securedownload/Resources/Private/Layouts
fal_securedownload/Resources/Private/Partials
fal_securedownload/Resources/Private/Templates
            
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If you want to override these you can set these constants:
plugin.tx_falsecuredownload {
  view {
    layoutRootPath = EXT:your_ext/path/to/your/layouts/folder
    partialRootPath = EXT:your_ext/path/to/your/partials/folder
    templateRootPath = EXT:your_ext/path/to/your/templates/folder
  }
}
            
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Collapsible FolderTree
There is a ready to use jQuery snippet available in the typoscript template of ext:fal_securedownload.
jQuery needs to be included in the FE for this to work.
The state of the collapsed folders is saved in the session of the user. When user is logged-in it is saved in the persisted session.