Asset Store Picture Problems

Hi guys could someone give me some advice.

As the templates i downloaded from unity3d/will/keyimages.zip or something similar. Unity will not accept them and says that Pic is not true 1010x389 rgba png.
This is so annoying been trying lots of different things now for about 4 hours.

Please someone help

Thanks

Sorted it thanks

In PhotoShop instead of saving it as a 32 bit PNG RGBA.

save it as a png in web and devices because in there it adds 8 bits to the current save and done!