When you want to run any previous year of TurboTax, go DIRECTLY to THAT year's folder in the ProgramFiles (x86) folder and run TurboTax.exe from there! I always make a desktop link to each year's TurboTax.exe file after I first install to avoid the troublesome WinPerReleaseEngine bugs and long delays. Using this method, I can still open my tax returns back to 2007!
For example, 2019 TurboTax lives at:
C:\Program Files (x86)\TurboTax\Premier 2019\32bit\TurboTax.exe
