
There are two models, ski version and wheel version. You will have to edit the panel.cfg and sound.cfg of the ski version because the folder name in the alias is incorrect.
Here is the Readme in the archive:
Upgrade versions An-2 2007 year. Change are made basically for VC (are taken into account all remarks of users for VC),
is collected together all additions for the winter variant of plane, add textures(2 winter text. and 8 summer text. (including textures by Roman E. Krauss).
This version is designed for FS2004 only. Detailed description models is enclosed in An2_manual.doc.
Autors: V.Zhyhulskiy (model, VC, panel, gauges, textures), Roman E. Krauss (textures).