I bought the package: Delta Force 10th Anniversary Collection
..and start to enter my keys into novaworld2.com - account but with start
of Delta Force (1) it results in Invalid Key!
I gave that package back (it was not closed original!) and bought
an new package of it and start again with Delta Force(1) and
this time the package was closed in plastic like original and was directly
bought from Amazon without resellers between.
the result - again - : Invalid Key!