[Trinket]

I didn't install the download package, I installed them myself
But here is my init.d scripts, it should be all you need for it to work!
I also start my daemons with low priority (10) and low I/O priority (best-effort).
These are my init.d scripts:
-sabnzbd
-sickbeard
-couchpotato
-transmission-daemon

The -N 10 is applied to all the daemons in order to have terminal commands executed faster.
The -I best-effort:6 parameter in sabnzbd and transmission lowers the I/O usage so that they don't interfere too much if I wish to see content from my PC streaming through the HDD attached to the Raspberry
All my daemons are executed by different users, so you may have to change them, but I have declared them as a variable so it shouldn't be a problem.
Hope it works now!
EDIT:Oh, forgot to mention, did you set anywhere in your init.d script "GROUP=download" you must do so, preferably at the start of the document where the rest of the variables are set!