FSGX 2010 works fine with P3D 4. Just add it through the scenery library, and move the entries down where they should be in the list. No way to tell about 2018, since it has not been released, the last I saw.
Sue
FS Global 2018 FTX DOWNLOAD
The successor to the 2010 version. Newest elevation data (from 2017), better loading times, better framerates, 64bit compatible.
Coming soon via The FlightSimStore ... stay tuned! More infos to be found here in the coming days!