I'm sorry for the trouble you're having with this. I think if you have a different machine that hasn't had the toolkit, you should be able to install 2.5 directly without this step. That said, I'm working to track this information down so you can roll forward your machine.
They are now live again. Sorry about that problem.
The PDF link now works on the live article page; the GO URLs will work by tomorrow; the system automatically pushes updated GO URLs live at midnight. In the meantime, the direct links are here:
Please post back if you are unable to retrieve the hotfix or if applying it doesn't allow you to upgrade your machine.
The links from within the document (in addition to the ones from above) should also now be working.
Downloads worked, I'll try updating when I get home tonight.
Looking forward to bending some new pixels...
Thanks, AIF Chuck!