Contact IMSI/Design sales, they should be able to help you.
Online Software Sales
IMSI/Design is dedicated to providing customers with a superior level of service. This section is designed to provide help with common questions regarding sales made directly from IMSIdesign.com, TurboCAD.com, and DoubleCAD.com. If you cannot find what you’re looking for, please contact us directly by email firstname.lastname@example.org or by telephone at 1.800.833.8082 or 1.415.483.8000 Monday through Friday between 8am and 5pm Pacific Time for assistance.