MY QUESTION IS ABOUT NOT BEING ABLE TO DOWNLOAD ANY PLUGINS!!!

I'm not able to download the WP for Android plugin! Starting at the Dashboard, when I click the download button, it's directing me to MPMU Dev site and I downloaded plugin from here and when I go back to WP to upload... its giving me a failed message no trace of plugin... can someone please help me? Thank you ***UPDATE*** IT'S NOT ALLOWING ME TO UPLOAD ANY PLUGIN! WHAT'S GOING ON? PLEASE HELP I'M ON THE CLOCK! =(