In the download dialog, you can immediately download individual files by clicking on "download file".
You can choose the original file (the format in which the file was placed on the server) or you can convert the file to another eligible format including Internet-compatible formats.
If you want to download several files at the same time, the button "Download ZIP Archive" is shown in the dialog. Here the selected files are compressed and packed into a common archive. This has the advantage that the download happens faster. Clicking on the button starts the download.
You will be notified if you do not have authorization to download the files. The ZIP archive will only contain files for which you have received permission.