Since it's someone else style you shouldn't upload like that and post a public link, then everyone can download it and the author may not wish that. I'd upload to your server in the root folder or whomever assist can login and modify the style directly via admincp and/or download. Is this a style that also came coupled with a plugin? IF so the color settings may be in the plugin itself, I've seen styles like that before.

Also can't speak about paying someone in this forum however you can post this in the paid request forum.

OK thanks for infos.