Unable to Download and/or Install

Hello there,

I just installed WPMU Dev Dashboard and I am trying to install the other plugins. But, it keeps telling me to install and when I click on install, it takes me to the WPMU website where it prompts me to install.

This is occurring again and again and I am unable to download/install any of the plugins except for the WPMU Dev Dashboard that I downloaded to my PC.

Please help. I just signed up earlier in the day (about 5 hours ago).

Thank you in advance.