Download file from Mirror

Can someone please help me out? I'm trying to figure out how to set up a nsi installer to download a file from a server, and incase that doesn't work download it from a mirror.

Is there any way to try to download from the first mirror, wait to see if it's successful, and if not then download from the next mirror in line?

Please help!

Thanks!

Edit: sorry, double-post.

Retrieve plugin's return value and if it's not success go to step 2 download from mirror.