I tried this as suggested with just Norway installed and it worked fine. The previous message saying "Unable to find the scenery.cfg file. Unable to find the scenery.cfg file". (yes it said it twice every time) disappeared, the data was placed in the Orbx folder and the scenery library was updated so I enjoyed several flights around Norway. I then reset FTX Central to default and installed several of my other Orbx sceneries (NZSI, NZNI and PFJ) and the situation appears to have reverted to what it was before, though all the installed scenery is in the correct folders, so the registry mod is working OK, there are no FTX entries in the scenery library and changing region in FTX Central, or running FTXconfigurator.exe now brings up the dreaded "Unable to find..." message again. I do have a "scenerylib_sceneryname.cfg entry in ...FSX\Orbx\scripts for each of my installed sceneries so could add them to the library manually but I suspect FTX Central makes other changes which are needed when you change region (to the autogen files?). I note that there are other .xml files in Scripts referencing the sceneryCFG location - FtxConfiguratorSettings.xml and OrbxControlPanelSettings.xml - as well as the two changed in this 'fix' but changing them to fsx-se didn't help.
Totally baffled! Perhaps we do need to be patient but it's been a month.
Mervyn