did you download it? if so, make sher you drag and place the file into the right folder. Go into the game title folder of the game you are working on, go to Grafics, then tileset's, then place it there. GO into the matiral base in the game, and you should see it under tileset. Next open the Database, and go to tilesets, then look on the bottom left, see change max, up the number 1^, next add a name to the tileset, and click tileset grafic on the right box, click on the one you want.
that will work for most verions I think, I used xp to write about it