The Fs2002 Lanc is by Dave Garwood and actually for Fs2002Pro.
As is,it won't run in Fs2004,but there are "fix" patches out there to make it run.
Some are better than others,so it's a matter of trial and error to find the best one.
The best Fs2004 Lanc I know of is PlaneDesign's B.I/B.II/B.III by Eddie Walters.
It's cockpit and all flight testing was done by the chaps that maintain and fly the CWH Lanc in Canada,so it's absolutely
spot on.
Mark