It is actually quite easy to download all the pictures or movies uploaded in a campaign.
Just go in the stats of the upload campaign.
In the "Games" tab, on the top of the list will appear a "Download All" button. Just click on it to export everything. Please bear in mind that the download can take time depending on the number of participants.
Qualifio will generate a .zip file that includes all photos under a folder for each participant. The name of the folder is the following : first name | last name | email