It's also very nice of you to spend the time to take me by the hand.
I've tried a couple of possible configurations. By default aria2 is supposed to look for the config file in $HOME/.aria/aria2.conf (but it doesn't), so there's the original there, and I made symlinks to it in various places to see if that would work, and no dice.
Just so you know, my HOME folder is an entire partition, maybe it makes a difference - I'm saying this because I know it's given problems with bitcasa for instance, even though it's an entire different type of software, you never know.
So the last code I tried was as such:
./aria2c --conf-path=/Volume/bhanquier/Library/Preferences/aria2.conf -x15 "$(pbpaste)"
and I've also tried putting a symlink in the workflow folder, where the aria2c binary is by the way:
./aria2c --conf-path=./aria2.conf -x15 "$(pbpaste)"
To get the download in the proper place I had to add an argument in the script, other wise it would download in the workflow folder:
./aria2c --dir=/Volumes/bhanquier/Downloads -x15 "$(pbpaste)"
One fortunate unexpected thing is, I get a notification when the download is finished, and I didn't do a thing about it expect link a notification sheet!