problems installing wpmudev dashboard

my domain is hosted by godaddy.com and i am using their dashboard. i dowlnloaded your zip file (285112_wpmu-dev-dashboard-3.3.3.zip) and then tried to uplaod it from within my godaddy dashboard (install plugin). I got the following error:

Installing Plugin from uploaded file: 285112_wpmu-dev-dashboard-3.3.3.zip

Unpacking the package…

Installing the plugin…

Destination folder already exists. /home/content/32/7306732/html/wp-content/plugins/wpmudev-updates/

Plugin install failed.

Return to Plugins page

Warning: Missing argument 3 for wpseo_upgrader_process_complete() in /home/content/32/7306732/html/wp-content/plugins/wordpress-seo/inc/wpseo-non-ajax-functions.php on line 259

Please tell me what i should do.

I am a neophyte to this world of WordPress and web site building in general.