This appears to be a popular topic today. Another thread with the same symptoms exploded today: https://learn.microsoft.com/en-us/answers/questions/464840/unable-to-install-sql-server-2019-developer-versio.html. There are some tips there you can try.
SQL Server 2019 Dev installer unable to download a required file with Windows 11 Pro

How to fix SQL Server 2019 Dev installer unable to download a required file with Windows 11 Pro?
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Tks
4 answers
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Seeya Xi-MSFT 16,261 Reputation points
2022-04-06T07:00:22.38+00:00 Hi @mbettaieb capbonconsulting.com ,
Welcome to Microsoft Q&A!
As Erland Said, it seems become a popular topic. You could vote this case to help it get more concerned.
Could you try to change the network or another disk to store that file? Or you can download the file from another machine and copy it to this machine.Best regards,
Seeya
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Bjoern Peters 8,601 Reputation points
2022-04-06T16:57:09.747+00:00 It has something to do with TLS and new Windows Updates, here is a solution from another forum.
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 DwordSource https://techcommunity.microsoft.com/t5/sql-serv
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".er/sql-server-installer-unable-to-download-the-required-files/m-p/2120065/highlight/true#M890
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mbettaieb capbonconsulting.com 1 Reputation point
2022-04-06T18:55:43.697+00:00 After reinstalling Windows. We run the latest updates... Rebooted the machine and this A.M. We were able to fully install it.
Not cool but at least it is working now.