Feature: done two or more download in the same time in on line

[olielvewen]

Hi Adrien,

I don't know if it's already doable but it would be nice and a plus for the user to be able to download at least two files at the same time.

From this bug, I noticed that when we do at least 2 downloads, we do not specify an absolute output path. Indeed, these files are found at the root of the project (i.e. at the same level as the executable)