Bought Oblivion DLC... but it doesn't fucking work

So... I caved in and bought the Orrery and Wizard's Tower mods for Oblivion for a whopping $3.78... but the fuckers don't work. When I get to the Activation step and click Next, both installers just hang. I've sent an email to Bethesda's tech support about it and they'll hopefully be able to clear up the problem (they'd better, anyway), but this is damn annoying.