After verifying you are entering the correct characters, if you are still getting the error, here's how to phone TurboTax Support during business hours.
Hours are 5AM-5PM Pacific (8AM-8 PM Eastern) Monday-Friday.
You can use this contact form to get an incident number and phone number:
https://support.turbotax.intuit.com/contact
In the form, where it asks for product, be sure to choose the CD/download version and for which OS (Windows or MAC), then choose which edition.
For issue, you can just say something like license activation error code 607 without quotes.
