Hi,
I made an error when I wrote: I am still with El Capitan, on à iMac 5k. My CS6 programs run poorly on it, but they do run. LR 5 does not work on capitan and Iassumewill not run on sierra.
It is LR 4 that Ii was not able to move to my new iMac.
The CS6 programs (PS, Illustrator, etc.) work but I found InDesign CS6 to be occasionally frustrating to use, so I bit the bullet and got the CC version.
Sorry for the incorrect info, I should have checked before writing!
Jean-Michel