Now I have got another problem. When I did the things that you wrote me, I was able to download the modpack, but it was Minecraft Vanilla.
I downloaded Backpacks from Curse, i edited the modpack link, but it says: error to download (previous link). Why it says that it can't download the pack beacuse it's the old Dropbox Link? Here's the new link: https://dl.dropbox.com/s/7ugqkd1y7r4hxeu/alexzanpack-1.0.zip
The Error is: