Hi, I've purchased this pack, but there is only a .psd file for download, but most of the other sprite sets have also the rendered transparent sprites in a .zip, which isn't in this one.
According to the included instructions below, it seems like this one should also have the rendered transparent sprites?
Extract the archived zip into your project. (You may need 7zip for easy extracting)
There are several rendered transparent sprite.
You can edit the sprite for more variation of expressions by .psd file.