You can download the lastest release of Indico from:
http://indico.cern.ch/dist/Indico-x.x.x.tarwhere x.x.x is the latest version, email the indico team for the latest version number: email@example.com
From the Management area within your conference, Go to the Contributions area and above the list of contributions there is a button for proceedings. If there are resources along with the contribution the main resource will be shown in the proceedings
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Wherever you see the small red pen you can click on this and modify the item.