You bought the 2019 Desktop program download? You can't use the Online version.
Turn off your antivirus. Use a different browser to download it like Chrome or FireFox. It doesn’t like IE11.
Access your downloads here
How to download your software purchase
Did you purchase and download one of the TurboTax 2019 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
If you purchased one of the TurboTax desktop editions from this website it is for tax year 2020 only - https://turbotax.intuit.com/personal-taxes/cd-download/
If this is what you did then request a refund -
Go to this TurboTax website to request a refund for the software purchased from TurboTax - https://support.turbotax.intuit.com/forms/refund-request.jsp
Use this TurboTax website to check your orders and payments -