1) Download OpenIV.
2) Download the mod.
3) Open the downloaded mod.
4) Extract the file "uppr_diff_015_b_uni.png".
5) Launch OpenIV.
6) Find the file "playerped.rpf" and open it.
7) Find the file "uppr_diff_015_b_uni.wtd" and open it.
8) Replace the file inside with the other previously extracted from the downloaded file.
9) Save all and launch the game.
10) Go to Modo and buy it.