I'm having the same EXACT problem. Though I haven't tried re-installing. But yeah, I've come to the forums looking for an answer to this problem as well.

The old version worked perfectly fine, no problems at all. I installed the new one, and now I can't download. Everything seems to be in perfect working order, I've turned off the firewalls, I've tried playing with some of the options, yet when I double click (or right click and choose download), it simply doesn't work.

HELP US SOMEONE!