It will have a folder inside it called 'sai-pack' and inside that folder will be multiple other folders. On my computer it will be in your downloads and be a zipped folder named sai-eng-pack-1.1.0 There are alot of great free textures on sai but this is a good starter pack ( Don't worry, it's safe.) It comes with these texturesĢ) open up the folder in which your texture pack was downloaded into.