@Niknek
If you have a popup window for purchasing an additional state program that has any missing elements or a non-functioning "Continue" button, etc. it may be related to screen resolution and/or scaling similar to the screen problem some folks experience who get a blank activation screen. If that's your situation, try a screen resolution of 800x600 and scaling of 100%. If that doesn't work, then also see the previous comment by user "crapgame" in this thread who purchased the additional state program by using the Online menu in the top TurboTax menubar and in the dropdown choosing "Download State."
If you end up needing to speak to TurboTax Customer Support, here's how to reach them during business hours. If necessary, they can take your payment and push the download of the additional state program.
