ok, first off, here's the link to the zip pack you requested.
[link]
As far as adding sounds in SkS, what you need to do is click on the text "Titlebar Buttons Freeform" there will be a + next to it, but it's of no concern. That particular section has it's own set of options. Once you see it you will see an option for "Sounds Enabled". Make sure it's set to 1. To set it, all you need to do is look to the lower part of the screen and you will see a text field with the word VALUE: to it's left. Hit the button, and change it to "Enabled" and the number next to the option to the right of the display area will change to 1, after that, add in the sounds you want, (.wav only), save, and apply.
I hope this helps