Okay folks, I've tried downloading Dead Space.  I think it succeeded, but when they game tried to install it, I got the Decompression Error message.  I changed the extract directory, but still get the same message.  I've been trying to figure out how to redownlaod it, but can't seem to mind the method.  The Application Data\Stardock\Impulse\Temporary\

DownloadQueue, ExtractedFiles, and PreloadData are all empty.  The new extract folder I Have is empty.

I can't find a reference to Dead Space any where.  So, I can't seem to redownload the game nor clear out any past references.  Is there some place I need to look that I've missed?

Update:  I had to completely quit Impulse and it is now redownloading again.  We'll see if it works this time, some 4 or so hours later.