Are we sure it's in the Zurich installer for FS9? I just bought this on May 23rd and I had to update the Addon Manager again after its install.
Yes. If you are not sure, just check the Addon Manager version you had for your Zurich installer, by right clicking on it: it's surely newer than 1.45, the version mentioned in this thread, that was released on January, and it's the first that is compatible with an FS9.EXE patched for >2GB.
However, the issue is that you need to run the *installer* again, to let it recognize your FS9.EXE, and install the correct version . There isn't a single version compatible with every possible FS9.EXE: we have two different versions, one is compatible with the original MS CD protection but not with the patch for >2GB of RAM, the other is compatible with >2GB patch, but requires a nocd FS9.EXE.
The installer (either for Zurich, O'Hare or the Addon Manager) need to run to check the FS9.EXE and install the right version. If you modify FS9.EXE after installing, you need to run the installer (any installer) again.