All-in-one-webmaster plug in problem

I tried to plug in all-in-one-webamaster to my site http://aas-bd.com but I could not.
It was showing like below for long.

Downloading install package from http://downloads.wordpress.org/plugin/all-in-one-webmaster.7.7.6.zip…

Unpacking the package…

I waited for long but it was never installed. Can anybody help how can I install this plug in to my site?