Ernie,
It's been a while since I purchased my copy but as I remember, When you purchased Micro Studio you were e-mailed a link, and all the information needed to down load. If you are using version 2.314 - 2.316 you can reuse that link and information to get 2.4. If you have a version older, as I have you need to go to
www.mtu.com and purchase a upgrade.
I hope this is correct, and helps
Jim