You need a Gold Subscription as far as I know, since I have one. You can also pull them off of Flightaware. But these usually need to be converted or modified to be fully functional in IF in most circumstances.
Would you consider using SimBrief ? The plans generated there are close to whats being flown IRL
and you can get SID /STAR info as well.
I use this and compare it to Flightaware and FR24 for final routing changes if needed. The info is stored for you. The good point is you can also create specific Airframe info and fuel factors etc. to get good flight specific fuel load and route data. Fully customizable.
There are a few links in the IFC data base to about this by searching