BlackBerry Curve 8330

I got a replacement curve yesterday. I was putting the UI the way I liked it, and came across one problem. I have opera mini 4.1 on there. I had mozilla on my previous one. Now, I'm unable to get it back on this one. It gives me 3 options. Mac,linux, and WM. which one do I use? I honestly don't remember how I downloaded it last time. Any help would be greatly appreciated.