I haven’t got the money to use 3ds max. But I’m sure other software can do it.
I’ve also found this thread in the Epic games forum.
https://forums.epicgames.com/threads/607176-Tutorial-Importing-Detailed-Terrain-from-Google-Earth
So I’ll try and give it a go once I have my new computer. (Right now I have a 2009 iMac intel duo which can’t run UE 4 properly)
Thanks for your help.