Cant make download button either :(
Are these tutorials upto date ? Cause there is no 'Button download press' option in trigger menu as it is said in the tutorial. ( http://www.webassist.com/tutorials/Apply-file-upload-or-download ) See attachement.
Step 2: Create the Download behavior
From the Insert menu, choose WebAssist > File Manipulation > Download.
From the Trigger menu, choose Button: download pressed.