That third paragraph is new. It was not there a month ago.
I purchased the upgrade for Disk Warrior in an attempt to repair a Drobo over a month ago. It would not boot my MacPro 2009 Quad it would just sit there.
First, Alsoft denied there was a problem and then after several heated emails and phone calls admitted it and blamed Apple.
Alsoft gets the same advanced information from Apple as does the other developers and I have booted my MacPro 2009 Quad from other developers disk without a problem. It's sloppy programming pure and simple. Unfortunately Alsoft isn't the only one, but it still doesn't make it right.