Hey... it might seem like they are a bit slow, but they will help you get the download issue sorted out. They have even gone and reauthorized a download in my store account a year after the original DL.... the download should show up in your store account and it should be active for 2 weeks initially. Plenty of time to DL it if something goes wrong.
If you have the emails with the DL link and the authorization/keys, I believe you can manually register the program and it should also be in your store. I have purchased quite a few things and they all show up in that store account fairly quickly.
As Beagle pointed out, one of the things I ordered never showed up. The site says give it 15 minutes for the servers to process the order and send the emails with the links for the DL..... An hour later still nothing. I checked in the spam folder and there they were. I moved them to the inbox and used the info to start the DL. I also bought a simple and inexpensive sound pak for a synth.... the sound pak never worked correctly. A few emails back and forth and turns out they had a problem in the sound pak..... it took a few weeks to resolve that but they did send me the new sound pak when it was properly checked and working.... It was a $20 product and they certainly went out of their way to resolve that issue for me.
It will be resolved for you too..... have faith.