Need help installing mobile shell skins

[simplycharming]

Please help. Im new to this world and have very little knowledge. I have a samsung omnia and have downloaded SPB mobile shell. Im disappointed with the widgets so i figured i would download mobile skins. Download instructions are simple enuf, but when i download the zip file and transfer it to my storage card i keep getting an error message saying the file could not be opened. What am i doing wrong? im soooo frustrated. ive made sure im downloading the right version and ive tried installing it a few times with no luck