Okay. I have gigs of extra harddrive space.
I tried reinstalling Sins. Nope.
I tried reseting Impulse and updating. It downloaded the Impulse update 100% and then said that there was an error.
Then I uninstalled Impulse, deleted the file, went to the Sins website, downloaded it again, reinstalled Impulse, updated it (seemed to work), and then tried to update Sins. Nope.