I have tried it on multiple computers and I have not yet managed to get a full complete download - my results have varied from downloads not even starting to getting stuck on ~20%.
The only reason I think they have used this is to try and "show off" or demonstrate their Air platform - but it really does not give me a lot of faith in it.
After firing up Fiddler and Network Monitor, I discovered that it does nothing more than log you in/set a cookie and establish an HTTP connection and pull the download, therefore, if you want to bypass it, simply:
1. Visit Adobe.com and log in (free registration).
2. Manually download This File
If this fails, instead of step 1, try visiting an alternate download link such as for Photoshop Elements - You do not actually need to download from here, you just need the authentication cookie.
I hope this helps.