Thanks for your quick reply, Lanarel.
The risk you mention, would it be an obvious one, or something causing severe trouble secretly and over time?
I know I am impatient now, but hows it with the arts-files? For every new client I needed relit BD maps - is it possible (necessary at all?Oo) to use old stuff either?
The risk I guess is messed-up shortcut files once the game tries to update the files. As I said, all my old shortcuts appeared fine (including most keys), but that does not mean there won't be problems later on.
About the maps, I cannot tell. If nothing changed to the art (e.g., someone planted a house somewhere), you should be safe using the old file. You would still have a hole in it though, that finally seems to be fixed. ALso, for some maps, there have been roads added to new places, and maybe even whole places got moved. Simplest way is to try the old map. If the came crashes, or you fall of the earth somewhere, you know it does not work.