The question in the title is something I hear a lot. But before answering, what is “progressive download”, anyway? Well, Wikipedia has a very good summary:
Progressive download is a term used to describe the transfer of digital media files from a server to a client, typically using the HTTP protocol when initiated from a computer. The consumer may begin playback of the media before the download is complete. The key difference between streaming media and progressive download is in how the digital media data is received and stored by the end user device that is accessing the digital media.
What this means is that Progressive download is a term used to describe a regular download of a media file. The only difference between “downloading” and “progressive downloading” is the second applies only to media files (video and/or audio), whereas the first applies to just about any kind of files. I’m fairly sure we owe the distinction to some marketing department.
In any case, does it mean Avalanche supports this? Of course it does. Avalanche supports the GET method in its HTTP implementation (among others), and as we’ve seen a progressive download is just that. So, yes, Avalanche Supports Progressive Downloading (At No Extra Price because HTTP is included in the basic license).