Do you have the 16 digit License Code? Can't you type it in the box?
How to activate the Desktop CD/Download program
https://ttlc.intuit.com/community/tax-topics/help/activating-turbotax-cd-download-software/01/852971
For Blank Activation screen
Sorry that second link above doesn't work anymore. Will this one help?
Yes, I have the activation code, but it doesn't get that far. After the initial startup and updates download I get a blank activation box.
Computer is a less than a year old PC laptop that is kept up to date.
Please try changing your screen resolution in order to correct the issue.
Blank activation screen - ttlc.intuit.com
If that doesn't' work, please contact TurboTax support to receive help over the phone.