How to bring OS X native Digital Camera RAW support from 10.11 El Capitan to 10.9 Mavericks? I work on an old Mac Pro and Mavericks 10.9 seems the best system for me.
However Apple is not updating Digital Camera RAW support for Mavericks and so does not support my new digital camera, a Nikon1 J5 that is supported in El Capitan.

A lot of programs that make catalogues are based on Apples native Digital Camera RAW support.

So I am looking for a solution to get native support for my new camera on Mavericks.  

I have the idea that native support is handled by two files in the OS X system:

/system/Library/coreservices/RawCamera.bundle 
/system/Library/coreservices/RawCameraSupport.bundle


I tried to replace these files in Mavericks with those of El Capitan.

But my mission was not successful.

Any help much appreciated!
Sticking with an older OS is going to leave you out of the loop on updates included in new versions. This is unavoidable if you are not willing to upgrade. For what it's worth, every older system that I have upgraded to El Capitan has seen some performance increases, in at least one case it was a significant bump in usability (early unibody MacBook that was barely usable in Yosemite is working beautifully in El Capitan).

Do a full system backup and give the newer OS a shot. It is difficult but not impossible to downgrade. If you can swap in a spare hard drive, and install from there, you won't risk your current setup just to check whether you can live with the changes implemented in 10.11.