Download a A340-600 payware of freeware

See how you find this thread:

http://www.airliners.net/aviation-forums/aviation_hobby/read.main/67648/

😉

The only freeware -600s available for fs9 are by Simubuild. ➡

http://library.avsim.net/search.php?SearchTerm=simubuild&CatID=fs2004&Go=Search

The above link contains plenty to try out, but there are -500s on those pages as well.
The Emirates is a complete package but it's a -500.

If you can't find a complete -600, do what I did, get d-aihk.zip and add Panel and Sound of your choice... easy. ➡

http://library.avsim.net/esearch.php?DLID=&Name=&FileName=d-aihk.zip&Author=&CatID=root

Once you've got that one up and flying, you can add other textures, plenty of them floating around.

And here's a payware one:

https://www.simshack.net/products/airbus-a340-500-600-combi-pack-fsx-fs2004-321

😉