Well after I spent 30mins on the phone with almost everyone in the service dept. It was finally concluded the software would not be needed unless an check eng light came on and then it would be required but covered under warranty. They suggested I get a jump on the problem, at a cost of $150.00,which may never occur by downloading the upgrade now. They did replace the ETM and download the upgrade for that unit then. They said it was separate from the ECM upgrade they suggested. The funny thing was no one could tell me just what the upgrade benefited or replaced. I have to conclude that most Volvo owners just go blindly down whatever path the dealer tells them to and pays the price.