This snippet builds the download link for a file field (formerly attribute) of the current content object

Build download link for a file field

{% set uri = 'content/download/' ~ content.contentInfo.id ~ '/' ~ content.getField('parameter_file').id
             ~ '/version/' ~ content.contentInfo.currentVersionNo ~  "/file/"
             ~ content.getField('parameter_file').value.fileName|escape( 'url' ) %}
{% set uri = path( 'ez_legacy', {'module_uri': uri} ) %}