Oops… A required file could not be downloaded.

Solution:

https://stackoverflow.com/questions/69526369/a-required-file-could-not-be-downloaded-while-installing-sql-server-2019-develop/70263907#70263907

Open PowerShell as administrator and run:

Set-ItemProperty -Path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type Dword

Set-ItemProperty -Path 'HKLM:\SOFTWARE\Microsoft\.NetFramework\v4.0.30319' -Name 'SchUseStrongCrypto' -Value '1' -Type Dword

608900cookie-checkSQL Server 2019 installation