OK, I am back as before now by restoring from backup. I am afraid this takes a little time as my FS setup is pretty large.
I think I went wrong through misunderstanding your reply. Should have asked further instead of jumping in!
Looking at the page you referred me to at http://www.fsdreamteam.com/products_cloud9.html
I can see the Stand-Alone Installer but not the FSDT installer for download. I may be being dumb here, but are you saying that for each scenery that has an FSDT installer I need to re-download and re-install the entire scenery? I'm happy to do that, of course, if that is the way. Then, having done that, install the Stand-Alone and use that only for the sceneries that don't have the FSDT installer.
I do apologies, this probably seems perfectly straightforward to you but for somebody that only needs to do it once in a blue moon it is all a bit daunting.
Thanks in advance,