If you just bought a Radius it most likely is the 60 watt model. There are no updates for that, so you don't have to be concerned.
I had one fairly old computer that used to do the Radii 40 watt updates fine and then one day, it would not. Even computer repair couldn't figure it out. (But they probably should have.

) So, I tried another computer and it worked without a hitch.
I suggest trying a friend's computer with the P3 updater when you get a chance. As these updaters used to wholesale for $199, I suggest keeping the $30 expenditure and trying again.