Just thought I'd check this out. Apparently if you are a registered user of TechTool Pro 3 you get an upgrade. However, if you, like me, trashed TechTool Pro 3 long ago and bought Drive 10 - forget it. You don't get an upgrade! This in spite of the fact that I got an Email direct from Micromat Sales in January that an upgrade from Drive 10 to TechTool Pro 4 would be available. I just quoted it and sent it back to them. Did I get a reply? Are you kidding? Grumble, grumble! jg