Installation : 1.Make sure you have IMG TOOL
               2.Replace sneaker.dff from player.img ( X:Rockstargames/GtaSanandreas/models/player.img )
                 with sneaker.dff from "to models,player.img" folder
               3.Do the same with all files 
If you don`t know how to perform the 2 step ... Then follow this tutorial ... 
               1.Open player.img ( X:Rockstargames/GtaSanandreas/models/player.img )
               2.Press F2 ( or click EDIT,FIND )
               3.Write there : sneaker.dff
               4.Press ENTER
               5.Press CTRL+R ( or Right click on it, Choose REPLACE )
               6.Now double click on sneaker.dff from "to models,player.img" folder
               7.Do the same with all files



