The package this Spitfire comes from is the "Early Spitfire pack" released by Aeroplane Heaven in May 2005. This package was part of 3. You had this package, the "mid-war Spitfires" and the "Griffon Spitfires". These packages were also sold by JustFlight under their own name. These CD's contained also CFS2 and CFS3 versions from this model.
As I don't own the packages sold by JustFlight I can't tell you exactly what is different. One thing I noticed when I downloaded a repaint by Paul "Bradburger" Bradford, is the the folder names are different instead of the the prefix AH_, JustFlight used their own prefix JF_, for the rest I didn't notice anything different. (As sound was aliased to a JF_ version, I had no sound when using this repaint).
As a bonus Aeroplane Heaven released a "Smittfire" and a Mk.Vb floater version and a slightly different version of the T.IX two seater as freeware. But as they all showed similarities, I expect they were all developed from the same model.
These separate packages are not available anymore, but I think JustFlight has repacked these models and did put them on a single CD/DVD.
When I look at the models in the screenshots and text below, which can be found at the JustFlight site, these are still the models developed in 2005.
"Officially licensed by the Royal Air Force and developed by Aeroplane Heaven, this is the definitive Spitfire expansion - 39 aircraft that span 14 different marks of Supermarine’s legendary fighter, including the famous prototype.
All models are compatible with FS2004 and FS2002; five variants run with CFS3 and two with CFS2."
My textures are free, so it is up to you whether you want to give them a try.
Cheers,
Huub