This zip file contains 3 .bmp images. Open your stick soldiers directory, go to the data folder then base, and copy the files there, overwriting the existing 3 with the same names.
(Eg: C://Games/StickSoldiers/Data/Base)

Make back-ups of the original files in case you don't like the new menu.

This alternate menu design has been created by Rapier, who is in no way affiliated with the creators of Stick Soldiers, and who has no resposibilty over the game or its contents.