This is usually a local problem, since there has been no systemic issues with the TurboTax website.
Contact TurboTax support for assistance with this problem of accessing the website to purchase software.
Support is open from 5am to 5pm Pacific time, Monday thru Friday
Use this website to contact TurboTax support during business hours - https://support.turbotax.intuit.com/contact/
Support can also be reached by messaging them on these pages https://www.facebook.com/turbotax/ and https://twitter.com/TeamTurboTax
