Need to file amended return for 2020

My 2020 return was e-filed in April 2021. I failed to include stock dividends reported on a Form 1099-DIV so I need to amend my 2020 return for the stock dividends.  I used the TurboTax 2020 software on my laptop to prepare the 2020 amended return. The Form 1040-X that was generated by TurboTax is "Rev. January 2020".  The IRS Form 1040-X Instructions state to use the July 2021 revision of Form 1040-X to amend 2019 and later tax returns. 

 

How do I get the July 2021 revision of Form 1040-X to generate when using TurboTax 2020?