The safest and only recommended method to download the SQL Server 2019 ISO is via the or the Microsoft Volume Licensing Service Center (VLSC) .
The first result: sql-2019-full-iso-free-fast.exe (29 MB. Obviously a virus.) sql 2019 iso download
Beneath it, a dead link: https://go.microsoft.com/fwlink/?linkid=sql2019_iso The safest and only recommended method to download
Once you've downloaded the ISO file, you can install SQL Server 2019 by: sql 2019 iso download