There was a bug in version 3.3.15 within the upload script for the download module, so that you were only able to upload images to the page. This bug is now fixed.
A full list of all new features and bugfixes can be found in our issue tracker!
We recommend you to read our announcements for version 3.3 if you have not done before.
If you are new to Admidio and want to install it on your webpage than the following wikipage could help: Install Admidio
The following wiki pages maybe interesting on an Update: Update Admidio