After installing subsequently Geneva, JFK, O'Hara, Las Vegas and Ft Lauderdale, and running FSX after each install, I got a message about the Couatl. This was OK, after running again the (new) Standalone manager. So, I guess, I have to redownload those airports also again.
Probably not, unless they are very old. It's usually enough to install the Stand-Alone Addon Manager after you install all the sceneries.
You said, that there is a download link to every page of each product. Do you mean at the FSDT forum pages, or at the FSDT product site?
The product pages on the main Web site, for example here:
http://www.fsdreamteam.com/products_phnl.html
