I need help compressing the size of my campaign

I'm ready to submit the demo for my campaign. This will be my first and so far i'm very proud of it but before i can submit it i need to compress the size of the campaign. Can anyone help me do this?

You can try Heavylock thats the only program I know of that can compress the W3X files.

Where can i get heavylock?

I think it's likely that you could have found this by doing a little digging around the forum.