Well boy oh boy, I gotta say that's quite a nifty little set up IK has going on.
You lay your money down - wait a few days for a license or 2 - download the new and 'completely useless' Authorization Manager, [as if the last one wasn't bad enough], and then after entering your serial numbers you're asked to download your products, and 'not to close this window until they're all installed'.
Ok - fair enough so far.
But then when you click on either of your products 'Download' links you're greeted with a big fat '403 Forbidden'!
Well how convenient - for IK that is!
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Edit: Ok things are a little better now. The new Authorization Manager didn't work, but the old one we're not supposed to use did.