You can download all items in a Folder with the 'Download all items' function. 

If there are numerous files in one folder, they can be downloaded fast and easy with one click, if the administrator of the scene has authorized this function. 

Navigate to the folder fo which you would like to download all contents of, and click on "Download all items". This way all the contents of the folder (and its subfolders' contents also) will be downloaded. 

If you only want to download some files, select them and choose "Download all items". This way only the selected files will be downloaded.