DDenn's?
If yes, that'd be payware.
No, not ddens but included in the recently released freeware Mitsubishi CRJ-200 at the .org and sorry, it’s a Challenger 850 instead of a CL-300. Hard to tell them apart sometimes especially when your memories fading off in the distance.
I have DDens 300 and it is one of the better add-ons for X-plane and at a realistic price. A fun, almost study level, aircraft. Fly it a lot.