My machine has 100+ gigs of free space.
I ran through the rest of the install part and it didn't crash, I checked it in Sonar and it's working.
I like that it loaded my d-pro. I found some inconsistencies (like the drums for the rapture classic don't work). The visual display on the right the text is truncated. The D-Pro settings don't show the "expansion" image that they came from (like D-Pro does). However, I like that you can access it those sounds.
My box is a very standard but decent Win 7, 64x, 17" with 24 inch 2nd monitor, 32 gig Ram, 200 GB HD space.
-Bruce