CS 4 and DNG Converter

Hi,

1) I'm trying to get my CS 4 work with DNG Converter but it seems hopeless. I've downloaded the ARC 5.7 and DNG Converter from the site but when I try to import a raw file via Bridge using the "Convert to DNG" function, it fails only saying "Convertion to DNG failed". I'm using Mac. The Photoshop CS 4 is a part of a "Master Collection"

2) I've recently switched to Mac and would like to use my Elements 9 disc I bought for Windows about 6 months ago. Is it possible to find Elements 9 on the site? I've tried...and if I would find it, can I download a Mac version using my licence key?

Thank you someone out there / Fredrik