Actually you can install it on 5 computers you own. Why did you buy another program? Are you in Canada by any chance?
For USA
Contact Customer Service for a refund
5am-9pm Pacific Time
7 days a week
https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
