You are the only one that found this strange issue, is certainly not an installer problem.
The only explanation I have, is that maybe FS9 was still closing when you installed Zurich, and some files were still open or locked (probably scenery.cfg) and that made that strange message appearing.
I wasn't closing FS9 as this was happening, only watching the thing activated itself after I purchased it.
That's when these weird things were happening.
I had just installed the Demo version and that's when I saw how beautiful it was and had to get it. It was during that final round of the activation process when these dialogs were appearing. Then the autogen/tree textures disappeared.
I figured something like you say was going on as FS, and especially FS9 is a bit finicky and fussy about scenery coming online. {You have to restart FS9 to see scenery changes unlike previous versions} As you say, it was being open or locked and/or the Scenery CFG was being looked at? I took a deep breath and hoped it was fine. I was so happy to see everything working fine after I closed FS9 and had it all back. {I had really bad luck with the FreeZ scenery last night while doing a flight for my VA and locked up as I was overflying their LSZH scenery and couldn't get it to work again}
{I'm also curious about a few files that now are in my Fsdreamteam directory that appeared once I activated it: 4 files with very small names " H} ", "è³ ", ".CFG" and " Á " , if these are okay I'll ignore them.}
I'll be lining up for more of your sceneries soon.
Regards
John